Home / 1,990.36-2,987.70-1,124.20

Finding the Fourth Proportional to 1,990.36, 2,987.70 and 1,124.20

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Solution

The fourth proportional to 1,990.36, 2,987.70 and 1,124.20 is: 1,687.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.36 : 2,987.70 = 1,124.20 : x
  2. Step 2: Convert to fraction form
    1,990.36/2,987.70 = 1,124.20/x
  3. Step 3: Cross multiply
    1,990.36x = 2,987.70 × 1,124.20
  4. Step 4: Simplify right side
    1,990.36x = 3,358,772.34
  5. Step 5: Solve for x
    x = 3,358,772.34/1,990.36
  6. Step 6: Final answer
    x = 1,687.52

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1.5x scale

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.