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Finding the Fourth Proportional to 753.75, 1,040.09 and 439.08

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Solution

The fourth proportional to 753.75, 1,040.09 and 439.08 is: 605.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.75 : 1,040.09 = 439.08 : x
  2. Step 2: Convert to fraction form
    753.75/1,040.09 = 439.08/x
  3. Step 3: Cross multiply
    753.75x = 1,040.09 × 439.08
  4. Step 4: Simplify right side
    753.75x = 456,682.72
  5. Step 5: Solve for x
    x = 456,682.72/753.75
  6. Step 6: Final answer
    x = 605.88

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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.