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Finding the Fourth Proportional to 753.98, 1,040.31 and 439.16

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Solution

The fourth proportional to 753.98, 1,040.31 and 439.16 is: 605.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.98 : 1,040.31 = 439.16 : x
  2. Step 2: Convert to fraction form
    753.98/1,040.31 = 439.16/x
  3. Step 3: Cross multiply
    753.98x = 1,040.31 × 439.16
  4. Step 4: Simplify right side
    753.98x = 456,857.34
  5. Step 5: Solve for x
    x = 456,857.34/753.98
  6. Step 6: Final answer
    x = 605.93

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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.