Home / 2,115.63-3,173.44-1,987.18

Finding the Fourth Proportional to 2,115.63, 3,173.44 and 1,987.18

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Solution

The fourth proportional to 2,115.63, 3,173.44 and 1,987.18 is: 2,980.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.63 : 3,173.44 = 1,987.18 : x
  2. Step 2: Convert to fraction form
    2,115.63/3,173.44 = 1,987.18/x
  3. Step 3: Cross multiply
    2,115.63x = 3,173.44 × 1,987.18
  4. Step 4: Simplify right side
    2,115.63x = 6,306,196.50
  5. Step 5: Solve for x
    x = 6,306,196.50/2,115.63
  6. Step 6: Final answer
    x = 2,980.77

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Double scale
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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.