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Finding the Fourth Proportional to 261.45, 392.28 and 99.15

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Solution

The fourth proportional to 261.45, 392.28 and 99.15 is: 148.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.45 : 392.28 = 99.15 : x
  2. Step 2: Convert to fraction form
    261.45/392.28 = 99.15/x
  3. Step 3: Cross multiply
    261.45x = 392.28 × 99.15
  4. Step 4: Simplify right side
    261.45x = 38,892.72
  5. Step 5: Solve for x
    x = 38,892.72/261.45
  6. Step 6: Final answer
    x = 148.76

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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.