Home / 12,142.12-18,209.58-5,215

Finding the Fourth Proportional to 12,142.12, 18,209.58 and 5,215

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Solution

The fourth proportional to 12,142.12, 18,209.58 and 5,215 is: 7,820.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,142.12 : 18,209.58 = 5,215 : x
  2. Step 2: Convert to fraction form
    12,142.12/18,209.58 = 5,215/x
  3. Step 3: Cross multiply
    12,142.12x = 18,209.58 × 5,215
  4. Step 4: Simplify right side
    12,142.12x = 94,962,959.70
  5. Step 5: Solve for x
    x = 94,962,959.70/12,142.12
  6. Step 6: Final answer
    x = 7,820.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.