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Finding the Fourth Proportional to 314.92, 472.43 and 129.79

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Solution

The fourth proportional to 314.92, 472.43 and 129.79 is: 194.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.92 : 472.43 = 129.79 : x
  2. Step 2: Convert to fraction form
    314.92/472.43 = 129.79/x
  3. Step 3: Cross multiply
    314.92x = 472.43 × 129.79
  4. Step 4: Simplify right side
    314.92x = 61,314.33
  5. Step 5: Solve for x
    x = 61,314.33/314.92
  6. Step 6: Final answer
    x = 194.70

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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.