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Finding the Fourth Proportional to 826.43, 1,239.03 and 278.46

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Solution

The fourth proportional to 826.43, 1,239.03 and 278.46 is: 417.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.43 : 1,239.03 = 278.46 : x
  2. Step 2: Convert to fraction form
    826.43/1,239.03 = 278.46/x
  3. Step 3: Cross multiply
    826.43x = 1,239.03 × 278.46
  4. Step 4: Simplify right side
    826.43x = 345,020.29
  5. Step 5: Solve for x
    x = 345,020.29/826.43
  6. Step 6: Final answer
    x = 417.49

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Half scale
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Double scale
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1.5x scale

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.