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Finding the Fourth Proportional to 12,398.70, 18,595.99 and 4,078.82

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Solution

The fourth proportional to 12,398.70, 18,595.99 and 4,078.82 is: 6,117.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,398.70 : 18,595.99 = 4,078.82 : x
  2. Step 2: Convert to fraction form
    12,398.70/18,595.99 = 4,078.82/x
  3. Step 3: Cross multiply
    12,398.70x = 18,595.99 × 4,078.82
  4. Step 4: Simplify right side
    12,398.70x = 75,849,608.05
  5. Step 5: Solve for x
    x = 75,849,608.05/12,398.70
  6. Step 6: Final answer
    x = 6,117.55

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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.