Home / 21,271.20-31,921.20-12,496.80

Finding the Fourth Proportional to 21,271.20, 31,921.20 and 12,496.80

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Solution

The fourth proportional to 21,271.20, 31,921.20 and 12,496.80 is: 18,753.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,271.20 : 31,921.20 = 12,496.80 : x
  2. Step 2: Convert to fraction form
    21,271.20/31,921.20 = 12,496.80/x
  3. Step 3: Cross multiply
    21,271.20x = 31,921.20 × 12,496.80
  4. Step 4: Simplify right side
    21,271.20x = 398,912,852.16
  5. Step 5: Solve for x
    x = 398,912,852.16/21,271.20
  6. Step 6: Final answer
    x = 18,753.66

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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.