Home / 20,689.40-31,043.70-10,839.80

Finding the Fourth Proportional to 20,689.40, 31,043.70 and 10,839.80

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Solution

The fourth proportional to 20,689.40, 31,043.70 and 10,839.80 is: 16,264.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.40 : 31,043.70 = 10,839.80 : x
  2. Step 2: Convert to fraction form
    20,689.40/31,043.70 = 10,839.80/x
  3. Step 3: Cross multiply
    20,689.40x = 31,043.70 × 10,839.80
  4. Step 4: Simplify right side
    20,689.40x = 336,507,499.26
  5. Step 5: Solve for x
    x = 336,507,499.26/20,689.40
  6. Step 6: Final answer
    x = 16,264.73

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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.