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Finding the Fourth Proportional to 1,151.20, 1,719.50 and 826.39

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Solution

The fourth proportional to 1,151.20, 1,719.50 and 826.39 is: 1,234.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.20 : 1,719.50 = 826.39 : x
  2. Step 2: Convert to fraction form
    1,151.20/1,719.50 = 826.39/x
  3. Step 3: Cross multiply
    1,151.20x = 1,719.50 × 826.39
  4. Step 4: Simplify right side
    1,151.20x = 1,420,977.61
  5. Step 5: Solve for x
    x = 1,420,977.61/1,151.20
  6. Step 6: Final answer
    x = 1,234.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.