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Finding the Fourth Proportional to 115.52, 159.34 and 74.06

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Solution

The fourth proportional to 115.52, 159.34 and 74.06 is: 102.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.52 : 159.34 = 74.06 : x
  2. Step 2: Convert to fraction form
    115.52/159.34 = 74.06/x
  3. Step 3: Cross multiply
    115.52x = 159.34 × 74.06
  4. Step 4: Simplify right side
    115.52x = 11,800.72
  5. Step 5: Solve for x
    x = 11,800.72/115.52
  6. Step 6: Final answer
    x = 102.15

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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.