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Finding the Fourth Proportional to 158.86, 219.30 and 100.72

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Solution

The fourth proportional to 158.86, 219.30 and 100.72 is: 139.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.86 : 219.30 = 100.72 : x
  2. Step 2: Convert to fraction form
    158.86/219.30 = 100.72/x
  3. Step 3: Cross multiply
    158.86x = 219.30 × 100.72
  4. Step 4: Simplify right side
    158.86x = 22,087.90
  5. Step 5: Solve for x
    x = 22,087.90/158.86
  6. Step 6: Final answer
    x = 139.04

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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.