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Finding the Fourth Proportional to 639,174.30, 958,761.45 and 402,783.90

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Solution

The fourth proportional to 639,174.30, 958,761.45 and 402,783.90 is: 604,175.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,174.30 : 958,761.45 = 402,783.90 : x
  2. Step 2: Convert to fraction form
    639,174.30/958,761.45 = 402,783.90/x
  3. Step 3: Cross multiply
    639,174.30x = 958,761.45 × 402,783.90
  4. Step 4: Simplify right side
    639,174.30x = 386,173,676,000.66
  5. Step 5: Solve for x
    x = 386,173,676,000.66/639,174.30
  6. Step 6: Final answer
    x = 604,175.85

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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.