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Finding the Fourth Proportional to 216,318.90, 324,509.40 and 66,571.86

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Solution

The fourth proportional to 216,318.90, 324,509.40 and 66,571.86 is: 99,867.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,318.90 : 324,509.40 = 66,571.86 : x
  2. Step 2: Convert to fraction form
    216,318.90/324,509.40 = 66,571.86/x
  3. Step 3: Cross multiply
    216,318.90x = 324,509.40 × 66,571.86
  4. Step 4: Simplify right side
    216,318.90x = 21,603,194,345.48
  5. Step 5: Solve for x
    x = 21,603,194,345.48/216,318.90
  6. Step 6: Final answer
    x = 99,867.35

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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.