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Finding the Fourth Proportional to 925.70, 1,388.55 and 824.90

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Solution

The fourth proportional to 925.70, 1,388.55 and 824.90 is: 1,237.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.70 : 1,388.55 = 824.90 : x
  2. Step 2: Convert to fraction form
    925.70/1,388.55 = 824.90/x
  3. Step 3: Cross multiply
    925.70x = 1,388.55 × 824.90
  4. Step 4: Simplify right side
    925.70x = 1,145,414.90
  5. Step 5: Solve for x
    x = 1,145,414.90/925.70
  6. Step 6: Final answer
    x = 1,237.35

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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.