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Finding the Fourth Proportional to 639,281.80, 958,922.70 and 402,891.40

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Solution

The fourth proportional to 639,281.80, 958,922.70 and 402,891.40 is: 604,337.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,281.80 : 958,922.70 = 402,891.40 : x
  2. Step 2: Convert to fraction form
    639,281.80/958,922.70 = 402,891.40/x
  3. Step 3: Cross multiply
    639,281.80x = 958,922.70 × 402,891.40
  4. Step 4: Simplify right side
    639,281.80x = 386,341,709,094.78
  5. Step 5: Solve for x
    x = 386,341,709,094.78/639,281.80
  6. Step 6: Final answer
    x = 604,337.10

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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.