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Finding the Fourth Proportional to 438,599.20, 656,440.80 and 318,314.20

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Solution

The fourth proportional to 438,599.20, 656,440.80 and 318,314.20 is: 476,413.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,599.20 : 656,440.80 = 318,314.20 : x
  2. Step 2: Convert to fraction form
    438,599.20/656,440.80 = 318,314.20/x
  3. Step 3: Cross multiply
    438,599.20x = 656,440.80 × 318,314.20
  4. Step 4: Simplify right side
    438,599.20x = 208,954,428,099.36
  5. Step 5: Solve for x
    x = 208,954,428,099.36/438,599.20
  6. Step 6: Final answer
    x = 476,413.15

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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.