Home / 21,630.80-32,381.40-12,861.20

Finding the Fourth Proportional to 21,630.80, 32,381.40 and 12,861.20

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Solution

The fourth proportional to 21,630.80, 32,381.40 and 12,861.20 is: 19,253.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,630.80 : 32,381.40 = 12,861.20 : x
  2. Step 2: Convert to fraction form
    21,630.80/32,381.40 = 12,861.20/x
  3. Step 3: Cross multiply
    21,630.80x = 32,381.40 × 12,861.20
  4. Step 4: Simplify right side
    21,630.80x = 416,463,661.68
  5. Step 5: Solve for x
    x = 416,463,661.68/21,630.80
  6. Step 6: Final answer
    x = 19,253.27

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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.