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Finding the Fourth Proportional to 753.77, 1,040.09 and 422.21

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Solution

The fourth proportional to 753.77, 1,040.09 and 422.21 is: 582.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.77 : 1,040.09 = 422.21 : x
  2. Step 2: Convert to fraction form
    753.77/1,040.09 = 422.21/x
  3. Step 3: Cross multiply
    753.77x = 1,040.09 × 422.21
  4. Step 4: Simplify right side
    753.77x = 439,131.20
  5. Step 5: Solve for x
    x = 439,131.20/753.77
  6. Step 6: Final answer
    x = 582.58

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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.