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Finding the Fourth Proportional to 826.24, 1,238.80 and 278.16

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Solution

The fourth proportional to 826.24, 1,238.80 and 278.16 is: 417.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.24 : 1,238.80 = 278.16 : x
  2. Step 2: Convert to fraction form
    826.24/1,238.80 = 278.16/x
  3. Step 3: Cross multiply
    826.24x = 1,238.80 × 278.16
  4. Step 4: Simplify right side
    826.24x = 344,584.61
  5. Step 5: Solve for x
    x = 344,584.61/826.24
  6. Step 6: Final answer
    x = 417.05

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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.