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Finding the Fourth Proportional to 292.80, 439.20 and 76.37

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Solution

The fourth proportional to 292.80, 439.20 and 76.37 is: 114.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.80 : 439.20 = 76.37 : x
  2. Step 2: Convert to fraction form
    292.80/439.20 = 76.37/x
  3. Step 3: Cross multiply
    292.80x = 439.20 × 76.37
  4. Step 4: Simplify right side
    292.80x = 33,542.52
  5. Step 5: Solve for x
    x = 33,542.52/292.80
  6. Step 6: Final answer
    x = 114.56

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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.