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Finding the Fourth Proportional to 1,174.76, 1,759.71 and 686.34

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Solution

The fourth proportional to 1,174.76, 1,759.71 and 686.34 is: 1,028.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,174.76 : 1,759.71 = 686.34 : x
  2. Step 2: Convert to fraction form
    1,174.76/1,759.71 = 686.34/x
  3. Step 3: Cross multiply
    1,174.76x = 1,759.71 × 686.34
  4. Step 4: Simplify right side
    1,174.76x = 1,207,759.36
  5. Step 5: Solve for x
    x = 1,207,759.36/1,174.76
  6. Step 6: Final answer
    x = 1,028.09

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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.