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Finding the Fourth Proportional to 115.81, 159.75 and 72.13

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Solution

The fourth proportional to 115.81, 159.75 and 72.13 is: 99.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.81 : 159.75 = 72.13 : x
  2. Step 2: Convert to fraction form
    115.81/159.75 = 72.13/x
  3. Step 3: Cross multiply
    115.81x = 159.75 × 72.13
  4. Step 4: Simplify right side
    115.81x = 11,522.77
  5. Step 5: Solve for x
    x = 11,522.77/115.81
  6. Step 6: Final answer
    x = 99.50

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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.