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Finding the Fourth Proportional to 750.57, 1,124.32 and 687.57

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Solution

The fourth proportional to 750.57, 1,124.32 and 687.57 is: 1,029.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.57 : 1,124.32 = 687.57 : x
  2. Step 2: Convert to fraction form
    750.57/1,124.32 = 687.57/x
  3. Step 3: Cross multiply
    750.57x = 1,124.32 × 687.57
  4. Step 4: Simplify right side
    750.57x = 773,048.70
  5. Step 5: Solve for x
    x = 773,048.70/750.57
  6. Step 6: Final answer
    x = 1,029.95

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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.