Home / 1,521.21-2,099.49-931.80

Finding the Fourth Proportional to 1,521.21, 2,099.49 and 931.80

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Solution

The fourth proportional to 1,521.21, 2,099.49 and 931.80 is: 1,286.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,521.21 : 2,099.49 = 931.80 : x
  2. Step 2: Convert to fraction form
    1,521.21/2,099.49 = 931.80/x
  3. Step 3: Cross multiply
    1,521.21x = 2,099.49 × 931.80
  4. Step 4: Simplify right side
    1,521.21x = 1,956,309.16
  5. Step 5: Solve for x
    x = 1,956,309.16/1,521.21
  6. Step 6: Final answer
    x = 1,286.02

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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.