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Finding the Fourth Proportional to 826.48, 1,239.72 and 279.12

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Solution

The fourth proportional to 826.48, 1,239.72 and 279.12 is: 418.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.48 : 1,239.72 = 279.12 : x
  2. Step 2: Convert to fraction form
    826.48/1,239.72 = 279.12/x
  3. Step 3: Cross multiply
    826.48x = 1,239.72 × 279.12
  4. Step 4: Simplify right side
    826.48x = 346,030.65
  5. Step 5: Solve for x
    x = 346,030.65/826.48
  6. Step 6: Final answer
    x = 418.68

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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.