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Finding the Fourth Proportional to 93.56, 129.70 and 90.38

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Solution

The fourth proportional to 93.56, 129.70 and 90.38 is: 125.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.56 : 129.70 = 90.38 : x
  2. Step 2: Convert to fraction form
    93.56/129.70 = 90.38/x
  3. Step 3: Cross multiply
    93.56x = 129.70 × 90.38
  4. Step 4: Simplify right side
    93.56x = 11,721.77
  5. Step 5: Solve for x
    x = 11,721.77/93.56
  6. Step 6: Final answer
    x = 125.28

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.