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Finding the Fourth Proportional to 1,521.32, 2,099.81 and 991.65

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Solution

The fourth proportional to 1,521.32, 2,099.81 and 991.65 is: 1,368.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,521.32 : 2,099.81 = 991.65 : x
  2. Step 2: Convert to fraction form
    1,521.32/2,099.81 = 991.65/x
  3. Step 3: Cross multiply
    1,521.32x = 2,099.81 × 991.65
  4. Step 4: Simplify right side
    1,521.32x = 2,082,276.59
  5. Step 5: Solve for x
    x = 2,082,276.59/1,521.32
  6. Step 6: Final answer
    x = 1,368.73

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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.