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Finding the Fourth Proportional to 826.81, 1,240.40 and 278.98

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Solution

The fourth proportional to 826.81, 1,240.40 and 278.98 is: 418.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.81 : 1,240.40 = 278.98 : x
  2. Step 2: Convert to fraction form
    826.81/1,240.40 = 278.98/x
  3. Step 3: Cross multiply
    826.81x = 1,240.40 × 278.98
  4. Step 4: Simplify right side
    826.81x = 346,046.79
  5. Step 5: Solve for x
    x = 346,046.79/826.81
  6. Step 6: Final answer
    x = 418.53

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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.