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Finding the Fourth Proportional to 438,602.20, 656,445.30 and 318,317.20

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Solution

The fourth proportional to 438,602.20, 656,445.30 and 318,317.20 is: 476,417.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,602.20 : 656,445.30 = 318,317.20 : x
  2. Step 2: Convert to fraction form
    438,602.20/656,445.30 = 318,317.20/x
  3. Step 3: Cross multiply
    438,602.20x = 656,445.30 × 318,317.20
  4. Step 4: Simplify right side
    438,602.20x = 208,957,829,849.16
  5. Step 5: Solve for x
    x = 208,957,829,849.16/438,602.20
  6. Step 6: Final answer
    x = 476,417.65

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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.