Home / 1,988.45-2,979-1,000.12

Finding the Fourth Proportional to 1,988.45, 2,979 and 1,000.12

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Solution

The fourth proportional to 1,988.45, 2,979 and 1,000.12 is: 1,498.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.45 : 2,979 = 1,000.12 : x
  2. Step 2: Convert to fraction form
    1,988.45/2,979 = 1,000.12/x
  3. Step 3: Cross multiply
    1,988.45x = 2,979 × 1,000.12
  4. Step 4: Simplify right side
    1,988.45x = 2,979,357.48
  5. Step 5: Solve for x
    x = 2,979,357.48/1,988.45
  6. Step 6: Final answer
    x = 1,498.33

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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.