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Finding the Fourth Proportional to 90.18, 124.43 and 51.37

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Solution

The fourth proportional to 90.18, 124.43 and 51.37 is: 70.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.18 : 124.43 = 51.37 : x
  2. Step 2: Convert to fraction form
    90.18/124.43 = 51.37/x
  3. Step 3: Cross multiply
    90.18x = 124.43 × 51.37
  4. Step 4: Simplify right side
    90.18x = 6,391.97
  5. Step 5: Solve for x
    x = 6,391.97/90.18
  6. Step 6: Final answer
    x = 70.88

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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.