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Finding the Fourth Proportional to 643,813.70, 965,720.55 and 404,312.90

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Solution

The fourth proportional to 643,813.70, 965,720.55 and 404,312.90 is: 606,469.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,813.70 : 965,720.55 = 404,312.90 : x
  2. Step 2: Convert to fraction form
    643,813.70/965,720.55 = 404,312.90/x
  3. Step 3: Cross multiply
    643,813.70x = 965,720.55 × 404,312.90
  4. Step 4: Simplify right side
    643,813.70x = 390,453,276,160.10
  5. Step 5: Solve for x
    x = 390,453,276,160.10/643,813.70
  6. Step 6: Final answer
    x = 606,469.35

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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.