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Finding the Fourth Proportional to 754.19, 1,040.76 and 439.47

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Solution

The fourth proportional to 754.19, 1,040.76 and 439.47 is: 606.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.19 : 1,040.76 = 439.47 : x
  2. Step 2: Convert to fraction form
    754.19/1,040.76 = 439.47/x
  3. Step 3: Cross multiply
    754.19x = 1,040.76 × 439.47
  4. Step 4: Simplify right side
    754.19x = 457,382.80
  5. Step 5: Solve for x
    x = 457,382.80/754.19
  6. Step 6: Final answer
    x = 606.46

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1.5x scale

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.