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Finding the Fourth Proportional to 261.89, 392.88 and 99.57

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Solution

The fourth proportional to 261.89, 392.88 and 99.57 is: 149.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.89 : 392.88 = 99.57 : x
  2. Step 2: Convert to fraction form
    261.89/392.88 = 99.57/x
  3. Step 3: Cross multiply
    261.89x = 392.88 × 99.57
  4. Step 4: Simplify right side
    261.89x = 39,119.06
  5. Step 5: Solve for x
    x = 39,119.06/261.89
  6. Step 6: Final answer
    x = 149.37

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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.