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Finding the Fourth Proportional to 261.62, 392.44 and 79.02

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Solution

The fourth proportional to 261.62, 392.44 and 79.02 is: 118.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.62 : 392.44 = 79.02 : x
  2. Step 2: Convert to fraction form
    261.62/392.44 = 79.02/x
  3. Step 3: Cross multiply
    261.62x = 392.44 × 79.02
  4. Step 4: Simplify right side
    261.62x = 31,011.78
  5. Step 5: Solve for x
    x = 31,011.78/261.62
  6. Step 6: Final answer
    x = 118.54

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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.