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Finding the Fourth Proportional to 93.85, 139.90 and 88.72

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Solution

The fourth proportional to 93.85, 139.90 and 88.72 is: 132.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.85 : 139.90 = 88.72 : x
  2. Step 2: Convert to fraction form
    93.85/139.90 = 88.72/x
  3. Step 3: Cross multiply
    93.85x = 139.90 × 88.72
  4. Step 4: Simplify right side
    93.85x = 12,410.78
  5. Step 5: Solve for x
    x = 12,410.78/93.85
  6. Step 6: Final answer
    x = 132.25

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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.