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Finding the Fourth Proportional to 158.19, 218.44 and 102.91

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Solution

The fourth proportional to 158.19, 218.44 and 102.91 is: 142.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.19 : 218.44 = 102.91 : x
  2. Step 2: Convert to fraction form
    158.19/218.44 = 102.91/x
  3. Step 3: Cross multiply
    158.19x = 218.44 × 102.91
  4. Step 4: Simplify right side
    158.19x = 22,478.86
  5. Step 5: Solve for x
    x = 22,478.86/158.19
  6. Step 6: Final answer
    x = 142.10

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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.