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Finding the Fourth Proportional to 750.62, 1,124.69 and 687.64

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Solution

The fourth proportional to 750.62, 1,124.69 and 687.64 is: 1,030.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.62 : 1,124.69 = 687.64 : x
  2. Step 2: Convert to fraction form
    750.62/1,124.69 = 687.64/x
  3. Step 3: Cross multiply
    750.62x = 1,124.69 × 687.64
  4. Step 4: Simplify right side
    750.62x = 773,377.69
  5. Step 5: Solve for x
    x = 773,377.69/750.62
  6. Step 6: Final answer
    x = 1,030.32

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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.