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Finding the Fourth Proportional to 261.71, 392.56 and 79.10

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Solution

The fourth proportional to 261.71, 392.56 and 79.10 is: 118.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.71 : 392.56 = 79.10 : x
  2. Step 2: Convert to fraction form
    261.71/392.56 = 79.10/x
  3. Step 3: Cross multiply
    261.71x = 392.56 × 79.10
  4. Step 4: Simplify right side
    261.71x = 31,052.02
  5. Step 5: Solve for x
    x = 31,052.02/261.71
  6. Step 6: Final answer
    x = 118.65

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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.