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Finding the Fourth Proportional to 89.71, 123.75 and 73.30

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Solution

The fourth proportional to 89.71, 123.75 and 73.30 is: 101.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.71 : 123.75 = 73.30 : x
  2. Step 2: Convert to fraction form
    89.71/123.75 = 73.30/x
  3. Step 3: Cross multiply
    89.71x = 123.75 × 73.30
  4. Step 4: Simplify right side
    89.71x = 9,070.88
  5. Step 5: Solve for x
    x = 9,070.88/89.71
  6. Step 6: Final answer
    x = 101.11

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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.