Home / 1,987.75-2,981.21-1,154.30

Finding the Fourth Proportional to 1,987.75, 2,981.21 and 1,154.30

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Solution

The fourth proportional to 1,987.75, 2,981.21 and 1,154.30 is: 1,731.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.75 : 2,981.21 = 1,154.30 : x
  2. Step 2: Convert to fraction form
    1,987.75/2,981.21 = 1,154.30/x
  3. Step 3: Cross multiply
    1,987.75x = 2,981.21 × 1,154.30
  4. Step 4: Simplify right side
    1,987.75x = 3,441,198.68
  5. Step 5: Solve for x
    x = 3,441,198.68/1,987.75
  6. Step 6: Final answer
    x = 1,731.21

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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.