Home / 20,518.10-28,315-11,086.68

Finding the Fourth Proportional to 20,518.10, 28,315 and 11,086.68

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Solution

The fourth proportional to 20,518.10, 28,315 and 11,086.68 is: 15,299.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,518.10 : 28,315 = 11,086.68 : x
  2. Step 2: Convert to fraction form
    20,518.10/28,315 = 11,086.68/x
  3. Step 3: Cross multiply
    20,518.10x = 28,315 × 11,086.68
  4. Step 4: Simplify right side
    20,518.10x = 313,919,344.20
  5. Step 5: Solve for x
    x = 313,919,344.20/20,518.10
  6. Step 6: Final answer
    x = 15,299.63

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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.