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Finding the Fourth Proportional to 315.12, 472.53 and 129.89

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Solution

The fourth proportional to 315.12, 472.53 and 129.89 is: 194.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.12 : 472.53 = 129.89 : x
  2. Step 2: Convert to fraction form
    315.12/472.53 = 129.89/x
  3. Step 3: Cross multiply
    315.12x = 472.53 × 129.89
  4. Step 4: Simplify right side
    315.12x = 61,376.82
  5. Step 5: Solve for x
    x = 61,376.82/315.12
  6. Step 6: Final answer
    x = 194.78

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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.