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Finding the Fourth Proportional to 925.85, 1,389.10 and 578.79

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Solution

The fourth proportional to 925.85, 1,389.10 and 578.79 is: 868.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.85 : 1,389.10 = 578.79 : x
  2. Step 2: Convert to fraction form
    925.85/1,389.10 = 578.79/x
  3. Step 3: Cross multiply
    925.85x = 1,389.10 × 578.79
  4. Step 4: Simplify right side
    925.85x = 803,997.19
  5. Step 5: Solve for x
    x = 803,997.19/925.85
  6. Step 6: Final answer
    x = 868.39

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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.