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Finding the Fourth Proportional to 725.49, 1,000.95 and 445.28

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Solution

The fourth proportional to 725.49, 1,000.95 and 445.28 is: 614.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.49 : 1,000.95 = 445.28 : x
  2. Step 2: Convert to fraction form
    725.49/1,000.95 = 445.28/x
  3. Step 3: Cross multiply
    725.49x = 1,000.95 × 445.28
  4. Step 4: Simplify right side
    725.49x = 445,703.02
  5. Step 5: Solve for x
    x = 445,703.02/725.49
  6. Step 6: Final answer
    x = 614.35

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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.