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Finding the Fourth Proportional to 261.79, 392.62 and 76.70

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Solution

The fourth proportional to 261.79, 392.62 and 76.70 is: 115.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.79 : 392.62 = 76.70 : x
  2. Step 2: Convert to fraction form
    261.79/392.62 = 76.70/x
  3. Step 3: Cross multiply
    261.79x = 392.62 × 76.70
  4. Step 4: Simplify right side
    261.79x = 30,112.09
  5. Step 5: Solve for x
    x = 30,112.09/261.79
  6. Step 6: Final answer
    x = 115.02

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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.