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Finding the Fourth Proportional to 261.32, 392.43 and 153.78

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Solution

The fourth proportional to 261.32, 392.43 and 153.78 is: 230.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.32 : 392.43 = 153.78 : x
  2. Step 2: Convert to fraction form
    261.32/392.43 = 153.78/x
  3. Step 3: Cross multiply
    261.32x = 392.43 × 153.78
  4. Step 4: Simplify right side
    261.32x = 60,347.89
  5. Step 5: Solve for x
    x = 60,347.89/261.32
  6. Step 6: Final answer
    x = 230.94

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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.