Home / 1,988.78-2,987.75-1,250.69

Finding the Fourth Proportional to 1,988.78, 2,987.75 and 1,250.69

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Solution

The fourth proportional to 1,988.78, 2,987.75 and 1,250.69 is: 1,878.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.78 : 2,987.75 = 1,250.69 : x
  2. Step 2: Convert to fraction form
    1,988.78/2,987.75 = 1,250.69/x
  3. Step 3: Cross multiply
    1,988.78x = 2,987.75 × 1,250.69
  4. Step 4: Simplify right side
    1,988.78x = 3,736,737.24
  5. Step 5: Solve for x
    x = 3,736,737.24/1,988.78
  6. Step 6: Final answer
    x = 1,878.91

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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.