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Finding the Fourth Proportional to 93.18, 140 and 86.52

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Solution

The fourth proportional to 93.18, 140 and 86.52 is: 129.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.18 : 140 = 86.52 : x
  2. Step 2: Convert to fraction form
    93.18/140 = 86.52/x
  3. Step 3: Cross multiply
    93.18x = 140 × 86.52
  4. Step 4: Simplify right side
    93.18x = 12,112.80
  5. Step 5: Solve for x
    x = 12,112.80/93.18
  6. Step 6: Final answer
    x = 129.99

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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.