Home / 2,140.15-3,209.95-679.45

Finding the Fourth Proportional to 2,140.15, 3,209.95 and 679.45

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Solution

The fourth proportional to 2,140.15, 3,209.95 and 679.45 is: 1,019.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.15 : 3,209.95 = 679.45 : x
  2. Step 2: Convert to fraction form
    2,140.15/3,209.95 = 679.45/x
  3. Step 3: Cross multiply
    2,140.15x = 3,209.95 × 679.45
  4. Step 4: Simplify right side
    2,140.15x = 2,181,000.53
  5. Step 5: Solve for x
    x = 2,181,000.53/2,140.15
  6. Step 6: Final answer
    x = 1,019.09

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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.