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Finding the Fourth Proportional to 826.28, 1,239.41 and 278.50

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Solution

The fourth proportional to 826.28, 1,239.41 and 278.50 is: 417.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.28 : 1,239.41 = 278.50 : x
  2. Step 2: Convert to fraction form
    826.28/1,239.41 = 278.50/x
  3. Step 3: Cross multiply
    826.28x = 1,239.41 × 278.50
  4. Step 4: Simplify right side
    826.28x = 345,177.74
  5. Step 5: Solve for x
    x = 345,177.74/826.28
  6. Step 6: Final answer
    x = 417.75

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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.