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Finding the Fourth Proportional to 117.66, 162.21 and 99.42

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Solution

The fourth proportional to 117.66, 162.21 and 99.42 is: 137.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.66 : 162.21 = 99.42 : x
  2. Step 2: Convert to fraction form
    117.66/162.21 = 99.42/x
  3. Step 3: Cross multiply
    117.66x = 162.21 × 99.42
  4. Step 4: Simplify right side
    117.66x = 16,126.92
  5. Step 5: Solve for x
    x = 16,126.92/117.66
  6. Step 6: Final answer
    x = 137.06

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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.