Home / 20,891.34-28,821.84-13,336.20

Finding the Fourth Proportional to 20,891.34, 28,821.84 and 13,336.20

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Solution

The fourth proportional to 20,891.34, 28,821.84 and 13,336.20 is: 18,398.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.34 : 28,821.84 = 13,336.20 : x
  2. Step 2: Convert to fraction form
    20,891.34/28,821.84 = 13,336.20/x
  3. Step 3: Cross multiply
    20,891.34x = 28,821.84 × 13,336.20
  4. Step 4: Simplify right side
    20,891.34x = 384,373,822.61
  5. Step 5: Solve for x
    x = 384,373,822.61/20,891.34
  6. Step 6: Final answer
    x = 18,398.72

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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.