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Finding the Fourth Proportional to 117.20, 175.72 and 99.92

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Solution

The fourth proportional to 117.20, 175.72 and 99.92 is: 149.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.20 : 175.72 = 99.92 : x
  2. Step 2: Convert to fraction form
    117.20/175.72 = 99.92/x
  3. Step 3: Cross multiply
    117.20x = 175.72 × 99.92
  4. Step 4: Simplify right side
    117.20x = 17,557.94
  5. Step 5: Solve for x
    x = 17,557.94/117.20
  6. Step 6: Final answer
    x = 149.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.