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Finding the Fourth Proportional to 1,124.78, 1,686.02 and 759.60

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Solution

The fourth proportional to 1,124.78, 1,686.02 and 759.60 is: 1,138.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.78 : 1,686.02 = 759.60 : x
  2. Step 2: Convert to fraction form
    1,124.78/1,686.02 = 759.60/x
  3. Step 3: Cross multiply
    1,124.78x = 1,686.02 × 759.60
  4. Step 4: Simplify right side
    1,124.78x = 1,280,696.99
  5. Step 5: Solve for x
    x = 1,280,696.99/1,124.78
  6. Step 6: Final answer
    x = 1,138.63

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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.