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Finding the Fourth Proportional to 261.78, 392.73 and 76.69

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Solution

The fourth proportional to 261.78, 392.73 and 76.69 is: 115.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.78 : 392.73 = 76.69 : x
  2. Step 2: Convert to fraction form
    261.78/392.73 = 76.69/x
  3. Step 3: Cross multiply
    261.78x = 392.73 × 76.69
  4. Step 4: Simplify right side
    261.78x = 30,118.46
  5. Step 5: Solve for x
    x = 30,118.46/261.78
  6. Step 6: Final answer
    x = 115.05

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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.