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Finding the Fourth Proportional to 398,635.78, 550,121.67 and 217,346.23

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Solution

The fourth proportional to 398,635.78, 550,121.67 and 217,346.23 is: 299,940.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,635.78 : 550,121.67 = 217,346.23 : x
  2. Step 2: Convert to fraction form
    398,635.78/550,121.67 = 217,346.23/x
  3. Step 3: Cross multiply
    398,635.78x = 550,121.67 × 217,346.23
  4. Step 4: Simplify right side
    398,635.78x = 119,566,871,015.80
  5. Step 5: Solve for x
    x = 119,566,871,015.80/398,635.78
  6. Step 6: Final answer
    x = 299,940.14

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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.