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Finding the Fourth Proportional to 15,826.80, 21,841.20 and 9,860.88

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Solution

The fourth proportional to 15,826.80, 21,841.20 and 9,860.88 is: 13,608.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,826.80 : 21,841.20 = 9,860.88 : x
  2. Step 2: Convert to fraction form
    15,826.80/21,841.20 = 9,860.88/x
  3. Step 3: Cross multiply
    15,826.80x = 21,841.20 × 9,860.88
  4. Step 4: Simplify right side
    15,826.80x = 215,373,452.26
  5. Step 5: Solve for x
    x = 215,373,452.26/15,826.80
  6. Step 6: Final answer
    x = 13,608.15

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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.