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Finding the Fourth Proportional to 315,372.80, 472,913.40 and 137,788.40

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Solution

The fourth proportional to 315,372.80, 472,913.40 and 137,788.40 is: 206,618.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,372.80 : 472,913.40 = 137,788.40 : x
  2. Step 2: Convert to fraction form
    315,372.80/472,913.40 = 137,788.40/x
  3. Step 3: Cross multiply
    315,372.80x = 472,913.40 × 137,788.40
  4. Step 4: Simplify right side
    315,372.80x = 65,161,980,724.56
  5. Step 5: Solve for x
    x = 65,161,980,724.56/315,372.80
  6. Step 6: Final answer
    x = 206,618.90

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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.