Home / 20,731.20-31,161.60-20,342.40

Finding the Fourth Proportional to 20,731.20, 31,161.60 and 20,342.40

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Solution

The fourth proportional to 20,731.20, 31,161.60 and 20,342.40 is: 30,577.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,731.20 : 31,161.60 = 20,342.40 : x
  2. Step 2: Convert to fraction form
    20,731.20/31,161.60 = 20,342.40/x
  3. Step 3: Cross multiply
    20,731.20x = 31,161.60 × 20,342.40
  4. Step 4: Simplify right side
    20,731.20x = 633,901,731.84
  5. Step 5: Solve for x
    x = 633,901,731.84/20,731.20
  6. Step 6: Final answer
    x = 30,577.18

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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.