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Finding the Fourth Proportional to 925.89, 1,387 and 486.48

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Solution

The fourth proportional to 925.89, 1,387 and 486.48 is: 728.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.89 : 1,387 = 486.48 : x
  2. Step 2: Convert to fraction form
    925.89/1,387 = 486.48/x
  3. Step 3: Cross multiply
    925.89x = 1,387 × 486.48
  4. Step 4: Simplify right side
    925.89x = 674,747.76
  5. Step 5: Solve for x
    x = 674,747.76/925.89
  6. Step 6: Final answer
    x = 728.76

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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.