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Finding the Fourth Proportional to 398,997.72, 550,612.15 and 217,705.75

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Solution

The fourth proportional to 398,997.72, 550,612.15 and 217,705.75 is: 300,431.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,997.72 : 550,612.15 = 217,705.75 : x
  2. Step 2: Convert to fraction form
    398,997.72/550,612.15 = 217,705.75/x
  3. Step 3: Cross multiply
    398,997.72x = 550,612.15 × 217,705.75
  4. Step 4: Simplify right side
    398,997.72x = 119,871,429,154.07
  5. Step 5: Solve for x
    x = 119,871,429,154.07/398,997.72
  6. Step 6: Final answer
    x = 300,431.36

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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.