Home / 12,261.78-18,378.20-5,239.74

Finding the Fourth Proportional to 12,261.78, 18,378.20 and 5,239.74

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Solution

The fourth proportional to 12,261.78, 18,378.20 and 5,239.74 is: 7,853.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,261.78 : 18,378.20 = 5,239.74 : x
  2. Step 2: Convert to fraction form
    12,261.78/18,378.20 = 5,239.74/x
  3. Step 3: Cross multiply
    12,261.78x = 18,378.20 × 5,239.74
  4. Step 4: Simplify right side
    12,261.78x = 96,296,989.67
  5. Step 5: Solve for x
    x = 96,296,989.67/12,261.78
  6. Step 6: Final answer
    x = 7,853.43

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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.