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Finding the Fourth Proportional to 261.31, 392.10 and 153.31

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Solution

The fourth proportional to 261.31, 392.10 and 153.31 is: 230.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.31 : 392.10 = 153.31 : x
  2. Step 2: Convert to fraction form
    261.31/392.10 = 153.31/x
  3. Step 3: Cross multiply
    261.31x = 392.10 × 153.31
  4. Step 4: Simplify right side
    261.31x = 60,112.85
  5. Step 5: Solve for x
    x = 60,112.85/261.31
  6. Step 6: Final answer
    x = 230.04

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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.