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Finding the Fourth Proportional to 90.10, 123.56 and 87.04

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Solution

The fourth proportional to 90.10, 123.56 and 87.04 is: 119.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.10 : 123.56 = 87.04 : x
  2. Step 2: Convert to fraction form
    90.10/123.56 = 87.04/x
  3. Step 3: Cross multiply
    90.10x = 123.56 × 87.04
  4. Step 4: Simplify right side
    90.10x = 10,754.66
  5. Step 5: Solve for x
    x = 10,754.66/90.10
  6. Step 6: Final answer
    x = 119.36

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.