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Finding the Fourth Proportional to 754.70, 1,040.91 and 661.28

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Solution

The fourth proportional to 754.70, 1,040.91 and 661.28 is: 912.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.70 : 1,040.91 = 661.28 : x
  2. Step 2: Convert to fraction form
    754.70/1,040.91 = 661.28/x
  3. Step 3: Cross multiply
    754.70x = 1,040.91 × 661.28
  4. Step 4: Simplify right side
    754.70x = 688,337.98
  5. Step 5: Solve for x
    x = 688,337.98/754.70
  6. Step 6: Final answer
    x = 912.07

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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.