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Finding the Fourth Proportional to 753.87, 1,040.55 and 439.38

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Solution

The fourth proportional to 753.87, 1,040.55 and 439.38 is: 606.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.87 : 1,040.55 = 439.38 : x
  2. Step 2: Convert to fraction form
    753.87/1,040.55 = 439.38/x
  3. Step 3: Cross multiply
    753.87x = 1,040.55 × 439.38
  4. Step 4: Simplify right side
    753.87x = 457,196.86
  5. Step 5: Solve for x
    x = 457,196.86/753.87
  6. Step 6: Final answer
    x = 606.47

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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.