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Finding the Fourth Proportional to 158.78, 237.95 and 71.90

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Solution

The fourth proportional to 158.78, 237.95 and 71.90 is: 107.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.78 : 237.95 = 71.90 : x
  2. Step 2: Convert to fraction form
    158.78/237.95 = 71.90/x
  3. Step 3: Cross multiply
    158.78x = 237.95 × 71.90
  4. Step 4: Simplify right side
    158.78x = 17,108.35
  5. Step 5: Solve for x
    x = 17,108.35/158.78
  6. Step 6: Final answer
    x = 107.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.