Home / 12,900.81-19,351.17-8,517.21

Finding the Fourth Proportional to 12,900.81, 19,351.17 and 8,517.21

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Solution

The fourth proportional to 12,900.81, 19,351.17 and 8,517.21 is: 12,775.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,900.81 : 19,351.17 = 8,517.21 : x
  2. Step 2: Convert to fraction form
    12,900.81/19,351.17 = 8,517.21/x
  3. Step 3: Cross multiply
    12,900.81x = 19,351.17 × 8,517.21
  4. Step 4: Simplify right side
    12,900.81x = 164,817,978.64
  5. Step 5: Solve for x
    x = 164,817,978.64/12,900.81
  6. Step 6: Final answer
    x = 12,775.79

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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.