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Finding the Fourth Proportional to 93.74, 139.91 and 91.31

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Solution

The fourth proportional to 93.74, 139.91 and 91.31 is: 136.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.74 : 139.91 = 91.31 : x
  2. Step 2: Convert to fraction form
    93.74/139.91 = 91.31/x
  3. Step 3: Cross multiply
    93.74x = 139.91 × 91.31
  4. Step 4: Simplify right side
    93.74x = 12,775.30
  5. Step 5: Solve for x
    x = 12,775.30/93.74
  6. Step 6: Final answer
    x = 136.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.