Home / 20,939.10-28,892.70-13,392.18

Finding the Fourth Proportional to 20,939.10, 28,892.70 and 13,392.18

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Solution

The fourth proportional to 20,939.10, 28,892.70 and 13,392.18 is: 18,479.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.10 : 28,892.70 = 13,392.18 : x
  2. Step 2: Convert to fraction form
    20,939.10/28,892.70 = 13,392.18/x
  3. Step 3: Cross multiply
    20,939.10x = 28,892.70 × 13,392.18
  4. Step 4: Simplify right side
    20,939.10x = 386,936,239.09
  5. Step 5: Solve for x
    x = 386,936,239.09/20,939.10
  6. Step 6: Final answer
    x = 18,479.12

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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.