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Finding the Fourth Proportional to 756.31, 1,043.70 and 445.75

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Solution

The fourth proportional to 756.31, 1,043.70 and 445.75 is: 615.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.31 : 1,043.70 = 445.75 : x
  2. Step 2: Convert to fraction form
    756.31/1,043.70 = 445.75/x
  3. Step 3: Cross multiply
    756.31x = 1,043.70 × 445.75
  4. Step 4: Simplify right side
    756.31x = 465,227.05
  5. Step 5: Solve for x
    x = 465,227.05/756.31
  6. Step 6: Final answer
    x = 615.13

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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.