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Finding the Fourth Proportional to 753.85, 1,040.02 and 439.06

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Solution

The fourth proportional to 753.85, 1,040.02 and 439.06 is: 605.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.85 : 1,040.02 = 439.06 : x
  2. Step 2: Convert to fraction form
    753.85/1,040.02 = 439.06/x
  3. Step 3: Cross multiply
    753.85x = 1,040.02 × 439.06
  4. Step 4: Simplify right side
    753.85x = 456,631.18
  5. Step 5: Solve for x
    x = 456,631.18/753.85
  6. Step 6: Final answer
    x = 605.73

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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.