Home / 1,987.05-2,742.20-1,200.94

Finding the Fourth Proportional to 1,987.05, 2,742.20 and 1,200.94

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Solution

The fourth proportional to 1,987.05, 2,742.20 and 1,200.94 is: 1,657.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.05 : 2,742.20 = 1,200.94 : x
  2. Step 2: Convert to fraction form
    1,987.05/2,742.20 = 1,200.94/x
  3. Step 3: Cross multiply
    1,987.05x = 2,742.20 × 1,200.94
  4. Step 4: Simplify right side
    1,987.05x = 3,293,217.67
  5. Step 5: Solve for x
    x = 3,293,217.67/1,987.05
  6. Step 6: Final answer
    x = 1,657.34

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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.