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Finding the Fourth Proportional to 753.81, 1,040.31 and 459

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Solution

The fourth proportional to 753.81, 1,040.31 and 459 is: 633.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.81 : 1,040.31 = 459 : x
  2. Step 2: Convert to fraction form
    753.81/1,040.31 = 459/x
  3. Step 3: Cross multiply
    753.81x = 1,040.31 × 459
  4. Step 4: Simplify right side
    753.81x = 477,502.29
  5. Step 5: Solve for x
    x = 477,502.29/753.81
  6. Step 6: Final answer
    x = 633.45

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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.