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Finding the Fourth Proportional to 279,707.92, 386,142.78 and 217,480.48

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Solution

The fourth proportional to 279,707.92, 386,142.78 and 217,480.48 is: 300,236.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,707.92 : 386,142.78 = 217,480.48 : x
  2. Step 2: Convert to fraction form
    279,707.92/386,142.78 = 217,480.48/x
  3. Step 3: Cross multiply
    279,707.92x = 386,142.78 × 217,480.48
  4. Step 4: Simplify right side
    279,707.92x = 83,978,517,142.93
  5. Step 5: Solve for x
    x = 83,978,517,142.93/279,707.92
  6. Step 6: Final answer
    x = 300,236.47

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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.