Home / 20,518.16-28,315-11,086.72

Finding the Fourth Proportional to 20,518.16, 28,315 and 11,086.72

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Solution

The fourth proportional to 20,518.16, 28,315 and 11,086.72 is: 15,299.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,518.16 : 28,315 = 11,086.72 : x
  2. Step 2: Convert to fraction form
    20,518.16/28,315 = 11,086.72/x
  3. Step 3: Cross multiply
    20,518.16x = 28,315 × 11,086.72
  4. Step 4: Simplify right side
    20,518.16x = 313,920,476.80
  5. Step 5: Solve for x
    x = 313,920,476.80/20,518.16
  6. Step 6: Final answer
    x = 15,299.64

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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.