Home / 2,987.96-4,123.85-2,103.21

Finding the Fourth Proportional to 2,987.96, 4,123.85 and 2,103.21

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Solution

The fourth proportional to 2,987.96, 4,123.85 and 2,103.21 is: 2,902.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.96 : 4,123.85 = 2,103.21 : x
  2. Step 2: Convert to fraction form
    2,987.96/4,123.85 = 2,103.21/x
  3. Step 3: Cross multiply
    2,987.96x = 4,123.85 × 2,103.21
  4. Step 4: Simplify right side
    2,987.96x = 8,673,312.04
  5. Step 5: Solve for x
    x = 8,673,312.04/2,987.96
  6. Step 6: Final answer
    x = 2,902.76

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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.