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Finding the Fourth Proportional to 261.92, 392.91 and 79.28

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Solution

The fourth proportional to 261.92, 392.91 and 79.28 is: 118.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.92 : 392.91 = 79.28 : x
  2. Step 2: Convert to fraction form
    261.92/392.91 = 79.28/x
  3. Step 3: Cross multiply
    261.92x = 392.91 × 79.28
  4. Step 4: Simplify right side
    261.92x = 31,150.89
  5. Step 5: Solve for x
    x = 31,150.89/261.92
  6. Step 6: Final answer
    x = 118.93

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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.