Home / 1,987.19-2,741.60-1,200.95

Finding the Fourth Proportional to 1,987.19, 2,741.60 and 1,200.95

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Solution

The fourth proportional to 1,987.19, 2,741.60 and 1,200.95 is: 1,656.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.19 : 2,741.60 = 1,200.95 : x
  2. Step 2: Convert to fraction form
    1,987.19/2,741.60 = 1,200.95/x
  3. Step 3: Cross multiply
    1,987.19x = 2,741.60 × 1,200.95
  4. Step 4: Simplify right side
    1,987.19x = 3,292,513.81
  5. Step 5: Solve for x
    x = 3,292,513.81/1,987.19
  6. Step 6: Final answer
    x = 1,656.87

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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.