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Finding the Fourth Proportional to 1,126.87, 1,689.15 and 760.79

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Solution

The fourth proportional to 1,126.87, 1,689.15 and 760.79 is: 1,140.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.87 : 1,689.15 = 760.79 : x
  2. Step 2: Convert to fraction form
    1,126.87/1,689.15 = 760.79/x
  3. Step 3: Cross multiply
    1,126.87x = 1,689.15 × 760.79
  4. Step 4: Simplify right side
    1,126.87x = 1,285,088.43
  5. Step 5: Solve for x
    x = 1,285,088.43/1,126.87
  6. Step 6: Final answer
    x = 1,140.41

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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.