Home / 1,987.90-2,979.30-1,110.40

Finding the Fourth Proportional to 1,987.90, 2,979.30 and 1,110.40

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Solution

The fourth proportional to 1,987.90, 2,979.30 and 1,110.40 is: 1,664.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.90 : 2,979.30 = 1,110.40 : x
  2. Step 2: Convert to fraction form
    1,987.90/2,979.30 = 1,110.40/x
  3. Step 3: Cross multiply
    1,987.90x = 2,979.30 × 1,110.40
  4. Step 4: Simplify right side
    1,987.90x = 3,308,214.72
  5. Step 5: Solve for x
    x = 3,308,214.72/1,987.90
  6. Step 6: Final answer
    x = 1,664.18

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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.