Home / 5,215.78-7,199.85-3,119.50

Finding the Fourth Proportional to 5,215.78, 7,199.85 and 3,119.50

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Solution

The fourth proportional to 5,215.78, 7,199.85 and 3,119.50 is: 4,306.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,215.78 : 7,199.85 = 3,119.50 : x
  2. Step 2: Convert to fraction form
    5,215.78/7,199.85 = 3,119.50/x
  3. Step 3: Cross multiply
    5,215.78x = 7,199.85 × 3,119.50
  4. Step 4: Simplify right side
    5,215.78x = 22,459,932.08
  5. Step 5: Solve for x
    x = 22,459,932.08/5,215.78
  6. Step 6: Final answer
    x = 4,306.15

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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.