Home / 1,987.30-2,742.48-1,201.20

Finding the Fourth Proportional to 1,987.30, 2,742.48 and 1,201.20

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Solution

The fourth proportional to 1,987.30, 2,742.48 and 1,201.20 is: 1,657.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.30 : 2,742.48 = 1,201.20 : x
  2. Step 2: Convert to fraction form
    1,987.30/2,742.48 = 1,201.20/x
  3. Step 3: Cross multiply
    1,987.30x = 2,742.48 × 1,201.20
  4. Step 4: Simplify right side
    1,987.30x = 3,294,266.98
  5. Step 5: Solve for x
    x = 3,294,266.98/1,987.30
  6. Step 6: Final answer
    x = 1,657.66

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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.