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Finding the Fourth Proportional to 119.91, 179.85 and 42.87

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Solution

The fourth proportional to 119.91, 179.85 and 42.87 is: 64.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.91 : 179.85 = 42.87 : x
  2. Step 2: Convert to fraction form
    119.91/179.85 = 42.87/x
  3. Step 3: Cross multiply
    119.91x = 179.85 × 42.87
  4. Step 4: Simplify right side
    119.91x = 7,710.17
  5. Step 5: Solve for x
    x = 7,710.17/119.91
  6. Step 6: Final answer
    x = 64.30

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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.