Home / 15,815.56-21,825.20-8,742.10

Finding the Fourth Proportional to 15,815.56, 21,825.20 and 8,742.10

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Solution

The fourth proportional to 15,815.56, 21,825.20 and 8,742.10 is: 12,063.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,815.56 : 21,825.20 = 8,742.10 : x
  2. Step 2: Convert to fraction form
    15,815.56/21,825.20 = 8,742.10/x
  3. Step 3: Cross multiply
    15,815.56x = 21,825.20 × 8,742.10
  4. Step 4: Simplify right side
    15,815.56x = 190,798,080.92
  5. Step 5: Solve for x
    x = 190,798,080.92/15,815.56
  6. Step 6: Final answer
    x = 12,063.95

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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.