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Finding the Fourth Proportional to 115.87, 159.91 and 72.20

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Solution

The fourth proportional to 115.87, 159.91 and 72.20 is: 99.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.87 : 159.91 = 72.20 : x
  2. Step 2: Convert to fraction form
    115.87/159.91 = 72.20/x
  3. Step 3: Cross multiply
    115.87x = 159.91 × 72.20
  4. Step 4: Simplify right side
    115.87x = 11,545.50
  5. Step 5: Solve for x
    x = 11,545.50/115.87
  6. Step 6: Final answer
    x = 99.64

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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.