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Finding the Fourth Proportional to 999.45, 1,380.26 and 750.38

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Solution

The fourth proportional to 999.45, 1,380.26 and 750.38 is: 1,036.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.45 : 1,380.26 = 750.38 : x
  2. Step 2: Convert to fraction form
    999.45/1,380.26 = 750.38/x
  3. Step 3: Cross multiply
    999.45x = 1,380.26 × 750.38
  4. Step 4: Simplify right side
    999.45x = 1,035,708.85
  5. Step 5: Solve for x
    x = 1,035,708.85/999.45
  6. Step 6: Final answer
    x = 1,036.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.