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Finding the Fourth Proportional to 826.10, 1,239.02 and 278.20

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Solution

The fourth proportional to 826.10, 1,239.02 and 278.20 is: 417.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.10 : 1,239.02 = 278.20 : x
  2. Step 2: Convert to fraction form
    826.10/1,239.02 = 278.20/x
  3. Step 3: Cross multiply
    826.10x = 1,239.02 × 278.20
  4. Step 4: Simplify right side
    826.10x = 344,695.36
  5. Step 5: Solve for x
    x = 344,695.36/826.10
  6. Step 6: Final answer
    x = 417.26

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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.