Home / 12,778.20-19,159.10-8,390.54

Finding the Fourth Proportional to 12,778.20, 19,159.10 and 8,390.54

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Solution

The fourth proportional to 12,778.20, 19,159.10 and 8,390.54 is: 12,580.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,778.20 : 19,159.10 = 8,390.54 : x
  2. Step 2: Convert to fraction form
    12,778.20/19,159.10 = 8,390.54/x
  3. Step 3: Cross multiply
    12,778.20x = 19,159.10 × 8,390.54
  4. Step 4: Simplify right side
    12,778.20x = 160,755,194.91
  5. Step 5: Solve for x
    x = 160,755,194.91/12,778.20
  6. Step 6: Final answer
    x = 12,580.43

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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.