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Finding the Fourth Proportional to 261.60, 392.46 and 99.28

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Solution

The fourth proportional to 261.60, 392.46 and 99.28 is: 148.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.60 : 392.46 = 99.28 : x
  2. Step 2: Convert to fraction form
    261.60/392.46 = 99.28/x
  3. Step 3: Cross multiply
    261.60x = 392.46 × 99.28
  4. Step 4: Simplify right side
    261.60x = 38,963.55
  5. Step 5: Solve for x
    x = 38,963.55/261.60
  6. Step 6: Final answer
    x = 148.95

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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.