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Finding the Fourth Proportional to 117.16, 174.69 and 100.12

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Solution

The fourth proportional to 117.16, 174.69 and 100.12 is: 149.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.16 : 174.69 = 100.12 : x
  2. Step 2: Convert to fraction form
    117.16/174.69 = 100.12/x
  3. Step 3: Cross multiply
    117.16x = 174.69 × 100.12
  4. Step 4: Simplify right side
    117.16x = 17,489.96
  5. Step 5: Solve for x
    x = 17,489.96/117.16
  6. Step 6: Final answer
    x = 149.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.