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Finding the Fourth Proportional to 115.52, 159.52 and 90.72

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Solution

The fourth proportional to 115.52, 159.52 and 90.72 is: 125.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.52 : 159.52 = 90.72 : x
  2. Step 2: Convert to fraction form
    115.52/159.52 = 90.72/x
  3. Step 3: Cross multiply
    115.52x = 159.52 × 90.72
  4. Step 4: Simplify right side
    115.52x = 14,471.65
  5. Step 5: Solve for x
    x = 14,471.65/115.52
  6. Step 6: Final answer
    x = 125.27

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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.