Home / 643,266.20-964,899.30-288,972.20

Finding the Fourth Proportional to 643,266.20, 964,899.30 and 288,972.20

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Solution

The fourth proportional to 643,266.20, 964,899.30 and 288,972.20 is: 433,458.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,266.20 : 964,899.30 = 288,972.20 : x
  2. Step 2: Convert to fraction form
    643,266.20/964,899.30 = 288,972.20/x
  3. Step 3: Cross multiply
    643,266.20x = 964,899.30 × 288,972.20
  4. Step 4: Simplify right side
    643,266.20x = 278,829,073,499.46
  5. Step 5: Solve for x
    x = 278,829,073,499.46/643,266.20
  6. Step 6: Final answer
    x = 433,458.30

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.