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Finding the Fourth Proportional to 93.38, 139.13 and 83.15

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Solution

The fourth proportional to 93.38, 139.13 and 83.15 is: 123.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.38 : 139.13 = 83.15 : x
  2. Step 2: Convert to fraction form
    93.38/139.13 = 83.15/x
  3. Step 3: Cross multiply
    93.38x = 139.13 × 83.15
  4. Step 4: Simplify right side
    93.38x = 11,569.24
  5. Step 5: Solve for x
    x = 11,569.24/93.38
  6. Step 6: Final answer
    x = 123.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.