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Finding the Fourth Proportional to 261.03, 391.31 and 124.12

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Solution

The fourth proportional to 261.03, 391.31 and 124.12 is: 186.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.03 : 391.31 = 124.12 : x
  2. Step 2: Convert to fraction form
    261.03/391.31 = 124.12/x
  3. Step 3: Cross multiply
    261.03x = 391.31 × 124.12
  4. Step 4: Simplify right side
    261.03x = 48,569.40
  5. Step 5: Solve for x
    x = 48,569.40/261.03
  6. Step 6: Final answer
    x = 186.07

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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.