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Finding the Fourth Proportional to 261.11, 391.47 and 124.08

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Solution

The fourth proportional to 261.11, 391.47 and 124.08 is: 186.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.11 : 391.47 = 124.08 : x
  2. Step 2: Convert to fraction form
    261.11/391.47 = 124.08/x
  3. Step 3: Cross multiply
    261.11x = 391.47 × 124.08
  4. Step 4: Simplify right side
    261.11x = 48,573.60
  5. Step 5: Solve for x
    x = 48,573.60/261.11
  6. Step 6: Final answer
    x = 186.03

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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.