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Finding the Fourth Proportional to 398,719.96, 550,223.55 and 217,435.38

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Solution

The fourth proportional to 398,719.96, 550,223.55 and 217,435.38 is: 300,055.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,719.96 : 550,223.55 = 217,435.38 : x
  2. Step 2: Convert to fraction form
    398,719.96/550,223.55 = 217,435.38/x
  3. Step 3: Cross multiply
    398,719.96x = 550,223.55 × 217,435.38
  4. Step 4: Simplify right side
    398,719.96x = 119,638,062,840.90
  5. Step 5: Solve for x
    x = 119,638,062,840.90/398,719.96
  6. Step 6: Final answer
    x = 300,055.37

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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.