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Finding the Fourth Proportional to 12,881, 19,314.40 and 3,993.87

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Solution

The fourth proportional to 12,881, 19,314.40 and 3,993.87 is: 5,988.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,881 : 19,314.40 = 3,993.87 : x
  2. Step 2: Convert to fraction form
    12,881/19,314.40 = 3,993.87/x
  3. Step 3: Cross multiply
    12,881x = 19,314.40 × 3,993.87
  4. Step 4: Simplify right side
    12,881x = 77,139,202.73
  5. Step 5: Solve for x
    x = 77,139,202.73/12,881
  6. Step 6: Final answer
    x = 5,988.60

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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.