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Finding the Fourth Proportional to 216,747.60, 325,145.70 and 66,986.70

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Solution

The fourth proportional to 216,747.60, 325,145.70 and 66,986.70 is: 100,487.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,747.60 : 325,145.70 = 66,986.70 : x
  2. Step 2: Convert to fraction form
    216,747.60/325,145.70 = 66,986.70/x
  3. Step 3: Cross multiply
    216,747.60x = 325,145.70 × 66,986.70
  4. Step 4: Simplify right side
    216,747.60x = 21,780,437,462.19
  5. Step 5: Solve for x
    x = 21,780,437,462.19/216,747.60
  6. Step 6: Final answer
    x = 100,487.56

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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.