Home / 21,143.20-31,729.20-12,368.80

Finding the Fourth Proportional to 21,143.20, 31,729.20 and 12,368.80

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Solution

The fourth proportional to 21,143.20, 31,729.20 and 12,368.80 is: 18,561.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,143.20 : 31,729.20 = 12,368.80 : x
  2. Step 2: Convert to fraction form
    21,143.20/31,729.20 = 12,368.80/x
  3. Step 3: Cross multiply
    21,143.20x = 31,729.20 × 12,368.80
  4. Step 4: Simplify right side
    21,143.20x = 392,452,128.96
  5. Step 5: Solve for x
    x = 392,452,128.96/21,143.20
  6. Step 6: Final answer
    x = 18,561.62

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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.