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Finding the Fourth Proportional to 261.59, 392.31 and 79

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Solution

The fourth proportional to 261.59, 392.31 and 79 is: 118.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.59 : 392.31 = 79 : x
  2. Step 2: Convert to fraction form
    261.59/392.31 = 79/x
  3. Step 3: Cross multiply
    261.59x = 392.31 × 79
  4. Step 4: Simplify right side
    261.59x = 30,992.49
  5. Step 5: Solve for x
    x = 30,992.49/261.59
  6. Step 6: Final answer
    x = 118.48

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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.