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Finding the Fourth Proportional to 216,519.86, 324,758.91 and 66,719.93

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Solution

The fourth proportional to 216,519.86, 324,758.91 and 66,719.93 is: 100,073.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,519.86 : 324,758.91 = 66,719.93 : x
  2. Step 2: Convert to fraction form
    216,519.86/324,758.91 = 66,719.93/x
  3. Step 3: Cross multiply
    216,519.86x = 324,758.91 × 66,719.93
  4. Step 4: Simplify right side
    216,519.86x = 21,667,890,812.74
  5. Step 5: Solve for x
    x = 21,667,890,812.74/216,519.86
  6. Step 6: Final answer
    x = 100,073.46

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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.