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Finding the Fourth Proportional to 824.80, 1,138.18 and 451.78

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Solution

The fourth proportional to 824.80, 1,138.18 and 451.78 is: 623.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.80 : 1,138.18 = 451.78 : x
  2. Step 2: Convert to fraction form
    824.80/1,138.18 = 451.78/x
  3. Step 3: Cross multiply
    824.80x = 1,138.18 × 451.78
  4. Step 4: Simplify right side
    824.80x = 514,206.96
  5. Step 5: Solve for x
    x = 514,206.96/824.80
  6. Step 6: Final answer
    x = 623.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.