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Finding the Fourth Proportional to 755.80, 1,139.28 and 693.40

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Solution

The fourth proportional to 755.80, 1,139.28 and 693.40 is: 1,045.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.80 : 1,139.28 = 693.40 : x
  2. Step 2: Convert to fraction form
    755.80/1,139.28 = 693.40/x
  3. Step 3: Cross multiply
    755.80x = 1,139.28 × 693.40
  4. Step 4: Simplify right side
    755.80x = 789,976.75
  5. Step 5: Solve for x
    x = 789,976.75/755.80
  6. Step 6: Final answer
    x = 1,045.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.