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Finding the Fourth Proportional to 753.79, 1,040.52 and 439.21

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Solution

The fourth proportional to 753.79, 1,040.52 and 439.21 is: 606.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.79 : 1,040.52 = 439.21 : x
  2. Step 2: Convert to fraction form
    753.79/1,040.52 = 439.21/x
  3. Step 3: Cross multiply
    753.79x = 1,040.52 × 439.21
  4. Step 4: Simplify right side
    753.79x = 457,006.79
  5. Step 5: Solve for x
    x = 457,006.79/753.79
  6. Step 6: Final answer
    x = 606.28

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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.