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Finding the Fourth Proportional to 93.80, 139.71 and 89.12

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Solution

The fourth proportional to 93.80, 139.71 and 89.12 is: 132.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.80 : 139.71 = 89.12 : x
  2. Step 2: Convert to fraction form
    93.80/139.71 = 89.12/x
  3. Step 3: Cross multiply
    93.80x = 139.71 × 89.12
  4. Step 4: Simplify right side
    93.80x = 12,450.26
  5. Step 5: Solve for x
    x = 12,450.26/93.80
  6. Step 6: Final answer
    x = 132.74

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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.