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Finding the Fourth Proportional to 158.39, 218.62 and 92.91

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Solution

The fourth proportional to 158.39, 218.62 and 92.91 is: 128.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.39 : 218.62 = 92.91 : x
  2. Step 2: Convert to fraction form
    158.39/218.62 = 92.91/x
  3. Step 3: Cross multiply
    158.39x = 218.62 × 92.91
  4. Step 4: Simplify right side
    158.39x = 20,312.40
  5. Step 5: Solve for x
    x = 20,312.40/158.39
  6. Step 6: Final answer
    x = 128.24

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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.