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Finding the Fourth Proportional to 93.60, 129.24 and 74.28

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Solution

The fourth proportional to 93.60, 129.24 and 74.28 is: 102.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.60 : 129.24 = 74.28 : x
  2. Step 2: Convert to fraction form
    93.60/129.24 = 74.28/x
  3. Step 3: Cross multiply
    93.60x = 129.24 × 74.28
  4. Step 4: Simplify right side
    93.60x = 9,599.95
  5. Step 5: Solve for x
    x = 9,599.95/93.60
  6. Step 6: Final answer
    x = 102.56

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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.