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Finding the Fourth Proportional to 925.56, 1,389.84 and 613.69

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Solution

The fourth proportional to 925.56, 1,389.84 and 613.69 is: 921.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.56 : 1,389.84 = 613.69 : x
  2. Step 2: Convert to fraction form
    925.56/1,389.84 = 613.69/x
  3. Step 3: Cross multiply
    925.56x = 1,389.84 × 613.69
  4. Step 4: Simplify right side
    925.56x = 852,930.91
  5. Step 5: Solve for x
    x = 852,930.91/925.56
  6. Step 6: Final answer
    x = 921.53

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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.