Home / 12,347.20-18,520.80-5,421.70

Finding the Fourth Proportional to 12,347.20, 18,520.80 and 5,421.70

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Solution

The fourth proportional to 12,347.20, 18,520.80 and 5,421.70 is: 8,132.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,347.20 : 18,520.80 = 5,421.70 : x
  2. Step 2: Convert to fraction form
    12,347.20/18,520.80 = 5,421.70/x
  3. Step 3: Cross multiply
    12,347.20x = 18,520.80 × 5,421.70
  4. Step 4: Simplify right side
    12,347.20x = 100,414,221.36
  5. Step 5: Solve for x
    x = 100,414,221.36/12,347.20
  6. Step 6: Final answer
    x = 8,132.55

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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.