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Finding the Fourth Proportional to 261.63, 392.46 and 76.52

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Solution

The fourth proportional to 261.63, 392.46 and 76.52 is: 114.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.63 : 392.46 = 76.52 : x
  2. Step 2: Convert to fraction form
    261.63/392.46 = 76.52/x
  3. Step 3: Cross multiply
    261.63x = 392.46 × 76.52
  4. Step 4: Simplify right side
    261.63x = 30,029.08
  5. Step 5: Solve for x
    x = 30,029.08/261.63
  6. Step 6: Final answer
    x = 114.78

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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.