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Finding the Fourth Proportional to 1,076.60, 1,617.62 and 686.78

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Solution

The fourth proportional to 1,076.60, 1,617.62 and 686.78 is: 1,031.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.60 : 1,617.62 = 686.78 : x
  2. Step 2: Convert to fraction form
    1,076.60/1,617.62 = 686.78/x
  3. Step 3: Cross multiply
    1,076.60x = 1,617.62 × 686.78
  4. Step 4: Simplify right side
    1,076.60x = 1,110,949.06
  5. Step 5: Solve for x
    x = 1,110,949.06/1,076.60
  6. Step 6: Final answer
    x = 1,031.91

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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.