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Finding the Fourth Proportional to 438,599.70, 656,441.55 and 318,314.70

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Solution

The fourth proportional to 438,599.70, 656,441.55 and 318,314.70 is: 476,413.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,599.70 : 656,441.55 = 318,314.70 : x
  2. Step 2: Convert to fraction form
    438,599.70/656,441.55 = 318,314.70/x
  3. Step 3: Cross multiply
    438,599.70x = 656,441.55 × 318,314.70
  4. Step 4: Simplify right side
    438,599.70x = 208,954,995,055.79
  5. Step 5: Solve for x
    x = 208,954,995,055.79/438,599.70
  6. Step 6: Final answer
    x = 476,413.90

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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.