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Finding the Fourth Proportional to 216,788.40, 325,217.92 and 66,993.76

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Solution

The fourth proportional to 216,788.40, 325,217.92 and 66,993.76 is: 100,501.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,788.40 : 325,217.92 = 66,993.76 : x
  2. Step 2: Convert to fraction form
    216,788.40/325,217.92 = 66,993.76/x
  3. Step 3: Cross multiply
    216,788.40x = 325,217.92 × 66,993.76
  4. Step 4: Simplify right side
    216,788.40x = 21,787,571,280.18
  5. Step 5: Solve for x
    x = 21,787,571,280.18/216,788.40
  6. Step 6: Final answer
    x = 100,501.55

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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.