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Finding the Fourth Proportional to 754.15, 1,040.71 and 422.59

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Solution

The fourth proportional to 754.15, 1,040.71 and 422.59 is: 583.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.15 : 1,040.71 = 422.59 : x
  2. Step 2: Convert to fraction form
    754.15/1,040.71 = 422.59/x
  3. Step 3: Cross multiply
    754.15x = 1,040.71 × 422.59
  4. Step 4: Simplify right side
    754.15x = 439,793.64
  5. Step 5: Solve for x
    x = 439,793.64/754.15
  6. Step 6: Final answer
    x = 583.16

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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.