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Finding the Fourth Proportional to 753.79, 1,040.08 and 422.15

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Solution

The fourth proportional to 753.79, 1,040.08 and 422.15 is: 582.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.79 : 1,040.08 = 422.15 : x
  2. Step 2: Convert to fraction form
    753.79/1,040.08 = 422.15/x
  3. Step 3: Cross multiply
    753.79x = 1,040.08 × 422.15
  4. Step 4: Simplify right side
    753.79x = 439,067.66
  5. Step 5: Solve for x
    x = 439,067.66/753.79
  6. Step 6: Final answer
    x = 582.48

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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.