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Finding the Fourth Proportional to 90.13, 124.30 and 74.58

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Solution

The fourth proportional to 90.13, 124.30 and 74.58 is: 102.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.13 : 124.30 = 74.58 : x
  2. Step 2: Convert to fraction form
    90.13/124.30 = 74.58/x
  3. Step 3: Cross multiply
    90.13x = 124.30 × 74.58
  4. Step 4: Simplify right side
    90.13x = 9,270.29
  5. Step 5: Solve for x
    x = 9,270.29/90.13
  6. Step 6: Final answer
    x = 102.85

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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.