Home / 2,987.20-4,122.71-1,808.25

Finding the Fourth Proportional to 2,987.20, 4,122.71 and 1,808.25

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Solution

The fourth proportional to 2,987.20, 4,122.71 and 1,808.25 is: 2,495.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.20 : 4,122.71 = 1,808.25 : x
  2. Step 2: Convert to fraction form
    2,987.20/4,122.71 = 1,808.25/x
  3. Step 3: Cross multiply
    2,987.20x = 4,122.71 × 1,808.25
  4. Step 4: Simplify right side
    2,987.20x = 7,454,890.36
  5. Step 5: Solve for x
    x = 7,454,890.36/2,987.20
  6. Step 6: Final answer
    x = 2,495.61

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1.5x scale

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.