Home / 3,937.20-5,429.88-2,891.76

Finding the Fourth Proportional to 3,937.20, 5,429.88 and 2,891.76

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Solution

The fourth proportional to 3,937.20, 5,429.88 and 2,891.76 is: 3,988.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,937.20 : 5,429.88 = 2,891.76 : x
  2. Step 2: Convert to fraction form
    3,937.20/5,429.88 = 2,891.76/x
  3. Step 3: Cross multiply
    3,937.20x = 5,429.88 × 2,891.76
  4. Step 4: Simplify right side
    3,937.20x = 15,701,909.79
  5. Step 5: Solve for x
    x = 15,701,909.79/3,937.20
  6. Step 6: Final answer
    x = 3,988.09

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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.