Home / 2,118.79-3,181.88-1,387.99

Finding the Fourth Proportional to 2,118.79, 3,181.88 and 1,387.99

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Solution

The fourth proportional to 2,118.79, 3,181.88 and 1,387.99 is: 2,084.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118.79 : 3,181.88 = 1,387.99 : x
  2. Step 2: Convert to fraction form
    2,118.79/3,181.88 = 1,387.99/x
  3. Step 3: Cross multiply
    2,118.79x = 3,181.88 × 1,387.99
  4. Step 4: Simplify right side
    2,118.79x = 4,416,417.62
  5. Step 5: Solve for x
    x = 4,416,417.62/2,118.79
  6. Step 6: Final answer
    x = 2,084.41

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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.