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Finding the Fourth Proportional to 113.86, 157.17 and 84.79

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Solution

The fourth proportional to 113.86, 157.17 and 84.79 is: 117.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.86 : 157.17 = 84.79 : x
  2. Step 2: Convert to fraction form
    113.86/157.17 = 84.79/x
  3. Step 3: Cross multiply
    113.86x = 157.17 × 84.79
  4. Step 4: Simplify right side
    113.86x = 13,326.44
  5. Step 5: Solve for x
    x = 13,326.44/113.86
  6. Step 6: Final answer
    x = 117.04

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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.