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Finding the Fourth Proportional to 158.91, 219.20 and 100.59

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Solution

The fourth proportional to 158.91, 219.20 and 100.59 is: 138.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.91 : 219.20 = 100.59 : x
  2. Step 2: Convert to fraction form
    158.91/219.20 = 100.59/x
  3. Step 3: Cross multiply
    158.91x = 219.20 × 100.59
  4. Step 4: Simplify right side
    158.91x = 22,048.83
  5. Step 5: Solve for x
    x = 22,048.83/158.91
  6. Step 6: Final answer
    x = 138.75

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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.