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Finding the Fourth Proportional to 750.89, 1,125.45 and 664.40

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Solution

The fourth proportional to 750.89, 1,125.45 and 664.40 is: 995.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.89 : 1,125.45 = 664.40 : x
  2. Step 2: Convert to fraction form
    750.89/1,125.45 = 664.40/x
  3. Step 3: Cross multiply
    750.89x = 1,125.45 × 664.40
  4. Step 4: Simplify right side
    750.89x = 747,745.14
  5. Step 5: Solve for x
    x = 747,745.14/750.89
  6. Step 6: Final answer
    x = 995.81

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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.