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Finding the Fourth Proportional to 158.91, 219.30 and 100.68

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Solution

The fourth proportional to 158.91, 219.30 and 100.68 is: 138.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.91 : 219.30 = 100.68 : x
  2. Step 2: Convert to fraction form
    158.91/219.30 = 100.68/x
  3. Step 3: Cross multiply
    158.91x = 219.30 × 100.68
  4. Step 4: Simplify right side
    158.91x = 22,079.12
  5. Step 5: Solve for x
    x = 22,079.12/158.91
  6. Step 6: Final answer
    x = 138.94

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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.