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Finding the Fourth Proportional to 261.74, 392.62 and 79.13

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Solution

The fourth proportional to 261.74, 392.62 and 79.13 is: 118.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.74 : 392.62 = 79.13 : x
  2. Step 2: Convert to fraction form
    261.74/392.62 = 79.13/x
  3. Step 3: Cross multiply
    261.74x = 392.62 × 79.13
  4. Step 4: Simplify right side
    261.74x = 31,065.66
  5. Step 5: Solve for x
    x = 31,065.66/261.74
  6. Step 6: Final answer
    x = 118.69

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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.