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Finding the Fourth Proportional to 90.50, 124.50 and 89.88

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Solution

The fourth proportional to 90.50, 124.50 and 89.88 is: 123.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.50 : 124.50 = 89.88 : x
  2. Step 2: Convert to fraction form
    90.50/124.50 = 89.88/x
  3. Step 3: Cross multiply
    90.50x = 124.50 × 89.88
  4. Step 4: Simplify right side
    90.50x = 11,190.06
  5. Step 5: Solve for x
    x = 11,190.06/90.50
  6. Step 6: Final answer
    x = 123.65

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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.