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Finding the Fourth Proportional to 261.63, 392.40 and 99.29

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Solution

The fourth proportional to 261.63, 392.40 and 99.29 is: 148.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.63 : 392.40 = 99.29 : x
  2. Step 2: Convert to fraction form
    261.63/392.40 = 99.29/x
  3. Step 3: Cross multiply
    261.63x = 392.40 × 99.29
  4. Step 4: Simplify right side
    261.63x = 38,962.38
  5. Step 5: Solve for x
    x = 38,962.38/261.63
  6. Step 6: Final answer
    x = 148.92

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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.