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Finding the Fourth Proportional to 93.10, 128.56 and 74.80

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Solution

The fourth proportional to 93.10, 128.56 and 74.80 is: 103.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.10 : 128.56 = 74.80 : x
  2. Step 2: Convert to fraction form
    93.10/128.56 = 74.80/x
  3. Step 3: Cross multiply
    93.10x = 128.56 × 74.80
  4. Step 4: Simplify right side
    93.10x = 9,616.25
  5. Step 5: Solve for x
    x = 9,616.25/93.10
  6. Step 6: Final answer
    x = 103.29

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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.