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Finding the Fourth Proportional to 750.92, 1,121.44 and 640.04

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Solution

The fourth proportional to 750.92, 1,121.44 and 640.04 is: 955.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.92 : 1,121.44 = 640.04 : x
  2. Step 2: Convert to fraction form
    750.92/1,121.44 = 640.04/x
  3. Step 3: Cross multiply
    750.92x = 1,121.44 × 640.04
  4. Step 4: Simplify right side
    750.92x = 717,766.46
  5. Step 5: Solve for x
    x = 717,766.46/750.92
  6. Step 6: Final answer
    x = 955.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.