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Finding the Fourth Proportional to 93.43, 139.45 and 86.75

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Solution

The fourth proportional to 93.43, 139.45 and 86.75 is: 129.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.43 : 139.45 = 86.75 : x
  2. Step 2: Convert to fraction form
    93.43/139.45 = 86.75/x
  3. Step 3: Cross multiply
    93.43x = 139.45 × 86.75
  4. Step 4: Simplify right side
    93.43x = 12,097.29
  5. Step 5: Solve for x
    x = 12,097.29/93.43
  6. Step 6: Final answer
    x = 129.49

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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.