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Finding the Fourth Proportional to 217,920.60, 326,816.10 and 84,724.20

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Solution

The fourth proportional to 217,920.60, 326,816.10 and 84,724.20 is: 127,061.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,920.60 : 326,816.10 = 84,724.20 : x
  2. Step 2: Convert to fraction form
    217,920.60/326,816.10 = 84,724.20/x
  3. Step 3: Cross multiply
    217,920.60x = 326,816.10 × 84,724.20
  4. Step 4: Simplify right side
    217,920.60x = 27,689,232,619.62
  5. Step 5: Solve for x
    x = 27,689,232,619.62/217,920.60
  6. Step 6: Final answer
    x = 127,061.11

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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.