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Finding the Fourth Proportional to 826.60, 1,239.48 and 278.44

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Solution

The fourth proportional to 826.60, 1,239.48 and 278.44 is: 417.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.60 : 1,239.48 = 278.44 : x
  2. Step 2: Convert to fraction form
    826.60/1,239.48 = 278.44/x
  3. Step 3: Cross multiply
    826.60x = 1,239.48 × 278.44
  4. Step 4: Simplify right side
    826.60x = 345,120.81
  5. Step 5: Solve for x
    x = 345,120.81/826.60
  6. Step 6: Final answer
    x = 417.52

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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.