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Finding the Fourth Proportional to 261.98, 393.18 and 153.86

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Solution

The fourth proportional to 261.98, 393.18 and 153.86 is: 230.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.98 : 393.18 = 153.86 : x
  2. Step 2: Convert to fraction form
    261.98/393.18 = 153.86/x
  3. Step 3: Cross multiply
    261.98x = 393.18 × 153.86
  4. Step 4: Simplify right side
    261.98x = 60,494.67
  5. Step 5: Solve for x
    x = 60,494.67/261.98
  6. Step 6: Final answer
    x = 230.91

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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.