Home / 20,719.80-31,043.70-18,689.40

Finding the Fourth Proportional to 20,719.80, 31,043.70 and 18,689.40

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Solution

The fourth proportional to 20,719.80, 31,043.70 and 18,689.40 is: 28,001.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,719.80 : 31,043.70 = 18,689.40 : x
  2. Step 2: Convert to fraction form
    20,719.80/31,043.70 = 18,689.40/x
  3. Step 3: Cross multiply
    20,719.80x = 31,043.70 × 18,689.40
  4. Step 4: Simplify right side
    20,719.80x = 580,188,126.78
  5. Step 5: Solve for x
    x = 580,188,126.78/20,719.80
  6. Step 6: Final answer
    x = 28,001.63

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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.