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Finding the Fourth Proportional to 261.66, 392.16 and 99.15

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Solution

The fourth proportional to 261.66, 392.16 and 99.15 is: 148.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.66 : 392.16 = 99.15 : x
  2. Step 2: Convert to fraction form
    261.66/392.16 = 99.15/x
  3. Step 3: Cross multiply
    261.66x = 392.16 × 99.15
  4. Step 4: Simplify right side
    261.66x = 38,882.66
  5. Step 5: Solve for x
    x = 38,882.66/261.66
  6. Step 6: Final answer
    x = 148.60

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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.