Home / 20,747.40-31,121.10-12,856.20

Finding the Fourth Proportional to 20,747.40, 31,121.10 and 12,856.20

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Solution

The fourth proportional to 20,747.40, 31,121.10 and 12,856.20 is: 19,284.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,747.40 : 31,121.10 = 12,856.20 : x
  2. Step 2: Convert to fraction form
    20,747.40/31,121.10 = 12,856.20/x
  3. Step 3: Cross multiply
    20,747.40x = 31,121.10 × 12,856.20
  4. Step 4: Simplify right side
    20,747.40x = 400,099,085.82
  5. Step 5: Solve for x
    x = 400,099,085.82/20,747.40
  6. Step 6: Final answer
    x = 19,284.30

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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.