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Finding the Fourth Proportional to 115.86, 159.85 and 74.40

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Solution

The fourth proportional to 115.86, 159.85 and 74.40 is: 102.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.86 : 159.85 = 74.40 : x
  2. Step 2: Convert to fraction form
    115.86/159.85 = 74.40/x
  3. Step 3: Cross multiply
    115.86x = 159.85 × 74.40
  4. Step 4: Simplify right side
    115.86x = 11,892.84
  5. Step 5: Solve for x
    x = 11,892.84/115.86
  6. Step 6: Final answer
    x = 102.65

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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.