Home / 20,878.38-31,309.80-8,394.20

Finding the Fourth Proportional to 20,878.38, 31,309.80 and 8,394.20

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Solution

The fourth proportional to 20,878.38, 31,309.80 and 8,394.20 is: 12,588.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.38 : 31,309.80 = 8,394.20 : x
  2. Step 2: Convert to fraction form
    20,878.38/31,309.80 = 8,394.20/x
  3. Step 3: Cross multiply
    20,878.38x = 31,309.80 × 8,394.20
  4. Step 4: Simplify right side
    20,878.38x = 262,820,723.16
  5. Step 5: Solve for x
    x = 262,820,723.16/20,878.38
  6. Step 6: Final answer
    x = 12,588.18

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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.