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Finding the Fourth Proportional to 1,119.76, 1,679.37 and 686.68

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Solution

The fourth proportional to 1,119.76, 1,679.37 and 686.68 is: 1,029.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.76 : 1,679.37 = 686.68 : x
  2. Step 2: Convert to fraction form
    1,119.76/1,679.37 = 686.68/x
  3. Step 3: Cross multiply
    1,119.76x = 1,679.37 × 686.68
  4. Step 4: Simplify right side
    1,119.76x = 1,153,189.79
  5. Step 5: Solve for x
    x = 1,153,189.79/1,119.76
  6. Step 6: Final answer
    x = 1,029.85

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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.