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Finding the Fourth Proportional to 721.88, 1,077.01 and 630.44

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Solution

The fourth proportional to 721.88, 1,077.01 and 630.44 is: 940.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.88 : 1,077.01 = 630.44 : x
  2. Step 2: Convert to fraction form
    721.88/1,077.01 = 630.44/x
  3. Step 3: Cross multiply
    721.88x = 1,077.01 × 630.44
  4. Step 4: Simplify right side
    721.88x = 678,990.18
  5. Step 5: Solve for x
    x = 678,990.18/721.88
  6. Step 6: Final answer
    x = 940.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.