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Finding the Fourth Proportional to 93.16, 128.60 and 71.38

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Solution

The fourth proportional to 93.16, 128.60 and 71.38 is: 98.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.16 : 128.60 = 71.38 : x
  2. Step 2: Convert to fraction form
    93.16/128.60 = 71.38/x
  3. Step 3: Cross multiply
    93.16x = 128.60 × 71.38
  4. Step 4: Simplify right side
    93.16x = 9,179.47
  5. Step 5: Solve for x
    x = 9,179.47/93.16
  6. Step 6: Final answer
    x = 98.53

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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.