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Finding the Fourth Proportional to 221,990.78, 306,243.38 and 145,489.52

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Solution

The fourth proportional to 221,990.78, 306,243.38 and 145,489.52 is: 200,707.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,990.78 : 306,243.38 = 145,489.52 : x
  2. Step 2: Convert to fraction form
    221,990.78/306,243.38 = 145,489.52/x
  3. Step 3: Cross multiply
    221,990.78x = 306,243.38 × 145,489.52
  4. Step 4: Simplify right side
    221,990.78x = 44,555,202,359.38
  5. Step 5: Solve for x
    x = 44,555,202,359.38/221,990.78
  6. Step 6: Final answer
    x = 200,707.45

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1.5x scale

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.