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Finding the Fourth Proportional to 117.02, 161.51 and 99.15

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Solution

The fourth proportional to 117.02, 161.51 and 99.15 is: 136.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.02 : 161.51 = 99.15 : x
  2. Step 2: Convert to fraction form
    117.02/161.51 = 99.15/x
  3. Step 3: Cross multiply
    117.02x = 161.51 × 99.15
  4. Step 4: Simplify right side
    117.02x = 16,013.72
  5. Step 5: Solve for x
    x = 16,013.72/117.02
  6. Step 6: Final answer
    x = 136.85

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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.