Home / 21,142.20-31,713.30-14,143.80

Finding the Fourth Proportional to 21,142.20, 31,713.30 and 14,143.80

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Solution

The fourth proportional to 21,142.20, 31,713.30 and 14,143.80 is: 21,215.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,142.20 : 31,713.30 = 14,143.80 : x
  2. Step 2: Convert to fraction form
    21,142.20/31,713.30 = 14,143.80/x
  3. Step 3: Cross multiply
    21,142.20x = 31,713.30 × 14,143.80
  4. Step 4: Simplify right side
    21,142.20x = 448,546,572.54
  5. Step 5: Solve for x
    x = 448,546,572.54/21,142.20
  6. Step 6: Final answer
    x = 21,215.70

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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.