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Finding the Fourth Proportional to 90.18, 124.50 and 63.63

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Solution

The fourth proportional to 90.18, 124.50 and 63.63 is: 87.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.18 : 124.50 = 63.63 : x
  2. Step 2: Convert to fraction form
    90.18/124.50 = 63.63/x
  3. Step 3: Cross multiply
    90.18x = 124.50 × 63.63
  4. Step 4: Simplify right side
    90.18x = 7,921.94
  5. Step 5: Solve for x
    x = 7,921.94/90.18
  6. Step 6: Final answer
    x = 87.85

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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.