Home / 5,115.40-7,681.20-3,738.40

Finding the Fourth Proportional to 5,115.40, 7,681.20 and 3,738.40

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Solution

The fourth proportional to 5,115.40, 7,681.20 and 3,738.40 is: 5,613.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,115.40 : 7,681.20 = 3,738.40 : x
  2. Step 2: Convert to fraction form
    5,115.40/7,681.20 = 3,738.40/x
  3. Step 3: Cross multiply
    5,115.40x = 7,681.20 × 3,738.40
  4. Step 4: Simplify right side
    5,115.40x = 28,715,398.08
  5. Step 5: Solve for x
    x = 28,715,398.08/5,115.40
  6. Step 6: Final answer
    x = 5,613.52

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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.