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Finding the Fourth Proportional to 826.24, 1,139.52 and 688

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Solution

The fourth proportional to 826.24, 1,139.52 and 688 is: 948.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.24 : 1,139.52 = 688 : x
  2. Step 2: Convert to fraction form
    826.24/1,139.52 = 688/x
  3. Step 3: Cross multiply
    826.24x = 1,139.52 × 688
  4. Step 4: Simplify right side
    826.24x = 783,989.76
  5. Step 5: Solve for x
    x = 783,989.76/826.24
  6. Step 6: Final answer
    x = 948.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.