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Finding the Fourth Proportional to 261.59, 392.40 and 131.72

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Solution

The fourth proportional to 261.59, 392.40 and 131.72 is: 197.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.59 : 392.40 = 131.72 : x
  2. Step 2: Convert to fraction form
    261.59/392.40 = 131.72/x
  3. Step 3: Cross multiply
    261.59x = 392.40 × 131.72
  4. Step 4: Simplify right side
    261.59x = 51,684.97
  5. Step 5: Solve for x
    x = 51,684.97/261.59
  6. Step 6: Final answer
    x = 197.58

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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.