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Finding the Fourth Proportional to 158.85, 219.21 and 100.73

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Solution

The fourth proportional to 158.85, 219.21 and 100.73 is: 139.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.85 : 219.21 = 100.73 : x
  2. Step 2: Convert to fraction form
    158.85/219.21 = 100.73/x
  3. Step 3: Cross multiply
    158.85x = 219.21 × 100.73
  4. Step 4: Simplify right side
    158.85x = 22,079.93
  5. Step 5: Solve for x
    x = 22,079.93/158.85
  6. Step 6: Final answer
    x = 139.00

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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.