Home / 20,938.20-31,407.30-12,643.80

Finding the Fourth Proportional to 20,938.20, 31,407.30 and 12,643.80

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Solution

The fourth proportional to 20,938.20, 31,407.30 and 12,643.80 is: 18,965.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,938.20 : 31,407.30 = 12,643.80 : x
  2. Step 2: Convert to fraction form
    20,938.20/31,407.30 = 12,643.80/x
  3. Step 3: Cross multiply
    20,938.20x = 31,407.30 × 12,643.80
  4. Step 4: Simplify right side
    20,938.20x = 397,107,619.74
  5. Step 5: Solve for x
    x = 397,107,619.74/20,938.20
  6. Step 6: Final answer
    x = 18,965.70

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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.