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Finding the Fourth Proportional to 158.52, 218.69 and 117.17

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Solution

The fourth proportional to 158.52, 218.69 and 117.17 is: 161.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.52 : 218.69 = 117.17 : x
  2. Step 2: Convert to fraction form
    158.52/218.69 = 117.17/x
  3. Step 3: Cross multiply
    158.52x = 218.69 × 117.17
  4. Step 4: Simplify right side
    158.52x = 25,623.07
  5. Step 5: Solve for x
    x = 25,623.07/158.52
  6. Step 6: Final answer
    x = 161.64

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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.