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Finding the Fourth Proportional to 12,578.76, 18,859.13 and 5,911.53

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Solution

The fourth proportional to 12,578.76, 18,859.13 and 5,911.53 is: 8,863.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,578.76 : 18,859.13 = 5,911.53 : x
  2. Step 2: Convert to fraction form
    12,578.76/18,859.13 = 5,911.53/x
  3. Step 3: Cross multiply
    12,578.76x = 18,859.13 × 5,911.53
  4. Step 4: Simplify right side
    12,578.76x = 111,486,283.21
  5. Step 5: Solve for x
    x = 111,486,283.21/12,578.76
  6. Step 6: Final answer
    x = 8,863.06

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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.