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Finding the Fourth Proportional to 261.56, 392.43 and 88.31

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Solution

The fourth proportional to 261.56, 392.43 and 88.31 is: 132.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.56 : 392.43 = 88.31 : x
  2. Step 2: Convert to fraction form
    261.56/392.43 = 88.31/x
  3. Step 3: Cross multiply
    261.56x = 392.43 × 88.31
  4. Step 4: Simplify right side
    261.56x = 34,655.49
  5. Step 5: Solve for x
    x = 34,655.49/261.56
  6. Step 6: Final answer
    x = 132.50

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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.