Home / 12,278.81-18,420.84-3,959.30

Finding the Fourth Proportional to 12,278.81, 18,420.84 and 3,959.30

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Solution

The fourth proportional to 12,278.81, 18,420.84 and 3,959.30 is: 5,939.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,278.81 : 18,420.84 = 3,959.30 : x
  2. Step 2: Convert to fraction form
    12,278.81/18,420.84 = 3,959.30/x
  3. Step 3: Cross multiply
    12,278.81x = 18,420.84 × 3,959.30
  4. Step 4: Simplify right side
    12,278.81x = 72,933,539.71
  5. Step 5: Solve for x
    x = 72,933,539.71/12,278.81
  6. Step 6: Final answer
    x = 5,939.79

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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.