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Finding the Fourth Proportional to 994.17, 1,490.04 and 721.20

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Solution

The fourth proportional to 994.17, 1,490.04 and 721.20 is: 1,080.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.17 : 1,490.04 = 721.20 : x
  2. Step 2: Convert to fraction form
    994.17/1,490.04 = 721.20/x
  3. Step 3: Cross multiply
    994.17x = 1,490.04 × 721.20
  4. Step 4: Simplify right side
    994.17x = 1,074,616.85
  5. Step 5: Solve for x
    x = 1,074,616.85/994.17
  6. Step 6: Final answer
    x = 1,080.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.