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Finding the Fourth Proportional to 93.18, 128.61 and 62.13

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Solution

The fourth proportional to 93.18, 128.61 and 62.13 is: 85.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.18 : 128.61 = 62.13 : x
  2. Step 2: Convert to fraction form
    93.18/128.61 = 62.13/x
  3. Step 3: Cross multiply
    93.18x = 128.61 × 62.13
  4. Step 4: Simplify right side
    93.18x = 7,990.54
  5. Step 5: Solve for x
    x = 7,990.54/93.18
  6. Step 6: Final answer
    x = 85.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.