Home / 643,766.40-903,139.20-643,766.40

Finding the Fourth Proportional to 643,766.40, 903,139.20 and 643,766.40

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Solution

The fourth proportional to 643,766.40, 903,139.20 and 643,766.40 is: 903,139.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,766.40 : 903,139.20 = 643,766.40 : x
  2. Step 2: Convert to fraction form
    643,766.40/903,139.20 = 643,766.40/x
  3. Step 3: Cross multiply
    643,766.40x = 903,139.20 × 643,766.40
  4. Step 4: Simplify right side
    643,766.40x = 581,410,671,482.88
  5. Step 5: Solve for x
    x = 581,410,671,482.88/643,766.40
  6. Step 6: Final answer
    x = 903,139.20

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.