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Finding the Fourth Proportional to 158.98, 219.45 and 100.75

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Solution

The fourth proportional to 158.98, 219.45 and 100.75 is: 139.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.98 : 219.45 = 100.75 : x
  2. Step 2: Convert to fraction form
    158.98/219.45 = 100.75/x
  3. Step 3: Cross multiply
    158.98x = 219.45 × 100.75
  4. Step 4: Simplify right side
    158.98x = 22,109.59
  5. Step 5: Solve for x
    x = 22,109.59/158.98
  6. Step 6: Final answer
    x = 139.07

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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.