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Finding the Fourth Proportional to 216,690.78, 325,015.20 and 66,890.70

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Solution

The fourth proportional to 216,690.78, 325,015.20 and 66,890.70 is: 100,329.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,690.78 : 325,015.20 = 66,890.70 : x
  2. Step 2: Convert to fraction form
    216,690.78/325,015.20 = 66,890.70/x
  3. Step 3: Cross multiply
    216,690.78x = 325,015.20 × 66,890.70
  4. Step 4: Simplify right side
    216,690.78x = 21,740,494,238.64
  5. Step 5: Solve for x
    x = 21,740,494,238.64/216,690.78
  6. Step 6: Final answer
    x = 100,329.58

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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.