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Finding the Fourth Proportional to 158.78, 219.02 and 100.50

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Solution

The fourth proportional to 158.78, 219.02 and 100.50 is: 138.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.78 : 219.02 = 100.50 : x
  2. Step 2: Convert to fraction form
    158.78/219.02 = 100.50/x
  3. Step 3: Cross multiply
    158.78x = 219.02 × 100.50
  4. Step 4: Simplify right side
    158.78x = 22,011.01
  5. Step 5: Solve for x
    x = 22,011.01/158.78
  6. Step 6: Final answer
    x = 138.63

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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.