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Finding the Fourth Proportional to 292.84, 439.28 and 76.42

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Solution

The fourth proportional to 292.84, 439.28 and 76.42 is: 114.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.84 : 439.28 = 76.42 : x
  2. Step 2: Convert to fraction form
    292.84/439.28 = 76.42/x
  3. Step 3: Cross multiply
    292.84x = 439.28 × 76.42
  4. Step 4: Simplify right side
    292.84x = 33,569.78
  5. Step 5: Solve for x
    x = 33,569.78/292.84
  6. Step 6: Final answer
    x = 114.64

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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.