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Finding the Fourth Proportional to 314.93, 472.38 and 83.81

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Solution

The fourth proportional to 314.93, 472.38 and 83.81 is: 125.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.93 : 472.38 = 83.81 : x
  2. Step 2: Convert to fraction form
    314.93/472.38 = 83.81/x
  3. Step 3: Cross multiply
    314.93x = 472.38 × 83.81
  4. Step 4: Simplify right side
    314.93x = 39,587.81
  5. Step 5: Solve for x
    x = 39,587.81/314.93
  6. Step 6: Final answer
    x = 125.71

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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.