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Finding the Fourth Proportional to 826.20, 1,138.13 and 707.79

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Solution

The fourth proportional to 826.20, 1,138.13 and 707.79 is: 975.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.20 : 1,138.13 = 707.79 : x
  2. Step 2: Convert to fraction form
    826.20/1,138.13 = 707.79/x
  3. Step 3: Cross multiply
    826.20x = 1,138.13 × 707.79
  4. Step 4: Simplify right side
    826.20x = 805,553.49
  5. Step 5: Solve for x
    x = 805,553.49/826.20
  6. Step 6: Final answer
    x = 975.01

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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.