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Finding the Fourth Proportional to 824.56, 1,235.19 and 660.35

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Solution

The fourth proportional to 824.56, 1,235.19 and 660.35 is: 989.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.56 : 1,235.19 = 660.35 : x
  2. Step 2: Convert to fraction form
    824.56/1,235.19 = 660.35/x
  3. Step 3: Cross multiply
    824.56x = 1,235.19 × 660.35
  4. Step 4: Simplify right side
    824.56x = 815,657.72
  5. Step 5: Solve for x
    x = 815,657.72/824.56
  6. Step 6: Final answer
    x = 989.20

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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.