Home / 20,278.87-30,418.50-7,131.35

Finding the Fourth Proportional to 20,278.87, 30,418.50 and 7,131.35

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Solution

The fourth proportional to 20,278.87, 30,418.50 and 7,131.35 is: 10,697.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,278.87 : 30,418.50 = 7,131.35 : x
  2. Step 2: Convert to fraction form
    20,278.87/30,418.50 = 7,131.35/x
  3. Step 3: Cross multiply
    20,278.87x = 30,418.50 × 7,131.35
  4. Step 4: Simplify right side
    20,278.87x = 216,924,969.98
  5. Step 5: Solve for x
    x = 216,924,969.98/20,278.87
  6. Step 6: Final answer
    x = 10,697.09

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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.