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Finding the Fourth Proportional to 115.95, 160.07 and 72.31

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Solution

The fourth proportional to 115.95, 160.07 and 72.31 is: 99.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.95 : 160.07 = 72.31 : x
  2. Step 2: Convert to fraction form
    115.95/160.07 = 72.31/x
  3. Step 3: Cross multiply
    115.95x = 160.07 × 72.31
  4. Step 4: Simplify right side
    115.95x = 11,574.66
  5. Step 5: Solve for x
    x = 11,574.66/115.95
  6. Step 6: Final answer
    x = 99.82

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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.