Home / 21,812.28-30,107.76-12,387.12

Finding the Fourth Proportional to 21,812.28, 30,107.76 and 12,387.12

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Solution

The fourth proportional to 21,812.28, 30,107.76 and 12,387.12 is: 17,098.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,812.28 : 30,107.76 = 12,387.12 : x
  2. Step 2: Convert to fraction form
    21,812.28/30,107.76 = 12,387.12/x
  3. Step 3: Cross multiply
    21,812.28x = 30,107.76 × 12,387.12
  4. Step 4: Simplify right side
    21,812.28x = 372,948,436.05
  5. Step 5: Solve for x
    x = 372,948,436.05/21,812.28
  6. Step 6: Final answer
    x = 17,098.10

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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.