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Finding the Fourth Proportional to 216,408, 324,626.72 and 66,639.04

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Solution

The fourth proportional to 216,408, 324,626.72 and 66,639.04 is: 99,963.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,408 : 324,626.72 = 66,639.04 : x
  2. Step 2: Convert to fraction form
    216,408/324,626.72 = 66,639.04/x
  3. Step 3: Cross multiply
    216,408x = 324,626.72 × 66,639.04
  4. Step 4: Simplify right side
    216,408x = 21,632,812,979.15
  5. Step 5: Solve for x
    x = 21,632,812,979.15/216,408
  6. Step 6: Final answer
    x = 99,963.09

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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.