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Finding the Fourth Proportional to 93.92, 139.68 and 88.20

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Solution

The fourth proportional to 93.92, 139.68 and 88.20 is: 131.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.92 : 139.68 = 88.20 : x
  2. Step 2: Convert to fraction form
    93.92/139.68 = 88.20/x
  3. Step 3: Cross multiply
    93.92x = 139.68 × 88.20
  4. Step 4: Simplify right side
    93.92x = 12,319.78
  5. Step 5: Solve for x
    x = 12,319.78/93.92
  6. Step 6: Final answer
    x = 131.18

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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.