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Finding the Fourth Proportional to 261.56, 392.45 and 97.13

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Solution

The fourth proportional to 261.56, 392.45 and 97.13 is: 145.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.56 : 392.45 = 97.13 : x
  2. Step 2: Convert to fraction form
    261.56/392.45 = 97.13/x
  3. Step 3: Cross multiply
    261.56x = 392.45 × 97.13
  4. Step 4: Simplify right side
    261.56x = 38,119.16
  5. Step 5: Solve for x
    x = 38,119.16/261.56
  6. Step 6: Final answer
    x = 145.74

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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.