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Finding the Fourth Proportional to 642,909.12, 887,213.08 and 356,421.84

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Solution

The fourth proportional to 642,909.12, 887,213.08 and 356,421.84 is: 491,861.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,909.12 : 887,213.08 = 356,421.84 : x
  2. Step 2: Convert to fraction form
    642,909.12/887,213.08 = 356,421.84/x
  3. Step 3: Cross multiply
    642,909.12x = 887,213.08 × 356,421.84
  4. Step 4: Simplify right side
    642,909.12x = 316,222,118,445.67
  5. Step 5: Solve for x
    x = 316,222,118,445.67/642,909.12
  6. Step 6: Final answer
    x = 491,861.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.