Home / 20,975.40-31,487.40-12,664.80

Finding the Fourth Proportional to 20,975.40, 31,487.40 and 12,664.80

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Solution

The fourth proportional to 20,975.40, 31,487.40 and 12,664.80 is: 19,011.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,975.40 : 31,487.40 = 12,664.80 : x
  2. Step 2: Convert to fraction form
    20,975.40/31,487.40 = 12,664.80/x
  3. Step 3: Cross multiply
    20,975.40x = 31,487.40 × 12,664.80
  4. Step 4: Simplify right side
    20,975.40x = 398,781,623.52
  5. Step 5: Solve for x
    x = 398,781,623.52/20,975.40
  6. Step 6: Final answer
    x = 19,011.87

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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.