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Finding the Fourth Proportional to 12,479.80, 18,721.62 and 5,909.56

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Solution

The fourth proportional to 12,479.80, 18,721.62 and 5,909.56 is: 8,865.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,479.80 : 18,721.62 = 5,909.56 : x
  2. Step 2: Convert to fraction form
    12,479.80/18,721.62 = 5,909.56/x
  3. Step 3: Cross multiply
    12,479.80x = 18,721.62 × 5,909.56
  4. Step 4: Simplify right side
    12,479.80x = 110,636,536.69
  5. Step 5: Solve for x
    x = 110,636,536.69/12,479.80
  6. Step 6: Final answer
    x = 8,865.25

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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.