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Finding the Fourth Proportional to 993.31, 1,490.49 and 721.65

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Solution

The fourth proportional to 993.31, 1,490.49 and 721.65 is: 1,082.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.31 : 1,490.49 = 721.65 : x
  2. Step 2: Convert to fraction form
    993.31/1,490.49 = 721.65/x
  3. Step 3: Cross multiply
    993.31x = 1,490.49 × 721.65
  4. Step 4: Simplify right side
    993.31x = 1,075,612.11
  5. Step 5: Solve for x
    x = 1,075,612.11/993.31
  6. Step 6: Final answer
    x = 1,082.86

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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.