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Finding the Fourth Proportional to 221,970, 306,318.60 and 121,368

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Solution

The fourth proportional to 221,970, 306,318.60 and 121,368 is: 167,487.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,970 : 306,318.60 = 121,368 : x
  2. Step 2: Convert to fraction form
    221,970/306,318.60 = 121,368/x
  3. Step 3: Cross multiply
    221,970x = 306,318.60 × 121,368
  4. Step 4: Simplify right side
    221,970x = 37,177,275,844.80
  5. Step 5: Solve for x
    x = 37,177,275,844.80/221,970
  6. Step 6: Final answer
    x = 167,487.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.