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Finding the Fourth Proportional to 1,987.54, 2,742.86 and 1,103.32

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Solution

The fourth proportional to 1,987.54, 2,742.86 and 1,103.32 is: 1,522.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.54 : 2,742.86 = 1,103.32 : x
  2. Step 2: Convert to fraction form
    1,987.54/2,742.86 = 1,103.32/x
  3. Step 3: Cross multiply
    1,987.54x = 2,742.86 × 1,103.32
  4. Step 4: Simplify right side
    1,987.54x = 3,026,252.30
  5. Step 5: Solve for x
    x = 3,026,252.30/1,987.54
  6. Step 6: Final answer
    x = 1,522.61

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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.