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Finding the Fourth Proportional to 824.70, 1,138.09 and 451.70

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Solution

The fourth proportional to 824.70, 1,138.09 and 451.70 is: 623.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.70 : 1,138.09 = 451.70 : x
  2. Step 2: Convert to fraction form
    824.70/1,138.09 = 451.70/x
  3. Step 3: Cross multiply
    824.70x = 1,138.09 × 451.70
  4. Step 4: Simplify right side
    824.70x = 514,076.97
  5. Step 5: Solve for x
    x = 514,076.97/824.70
  6. Step 6: Final answer
    x = 623.35

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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.