Home / 3,515.42-5,280.65-2,129.40

Finding the Fourth Proportional to 3,515.42, 5,280.65 and 2,129.40

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Solution

The fourth proportional to 3,515.42, 5,280.65 and 2,129.40 is: 3,198.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,515.42 : 5,280.65 = 2,129.40 : x
  2. Step 2: Convert to fraction form
    3,515.42/5,280.65 = 2,129.40/x
  3. Step 3: Cross multiply
    3,515.42x = 5,280.65 × 2,129.40
  4. Step 4: Simplify right side
    3,515.42x = 11,244,605.46
  5. Step 5: Solve for x
    x = 11,244,605.46/3,515.42
  6. Step 6: Final answer
    x = 3,198.66

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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.