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Finding the Fourth Proportional to 398,934.72, 550,528.68 and 217,645.35

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Solution

The fourth proportional to 398,934.72, 550,528.68 and 217,645.35 is: 300,349.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,934.72 : 550,528.68 = 217,645.35 : x
  2. Step 2: Convert to fraction form
    398,934.72/550,528.68 = 217,645.35/x
  3. Step 3: Cross multiply
    398,934.72x = 550,528.68 × 217,645.35
  4. Step 4: Simplify right side
    398,934.72x = 119,820,007,243.64
  5. Step 5: Solve for x
    x = 119,820,007,243.64/398,934.72
  6. Step 6: Final answer
    x = 300,349.91

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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.