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Finding the Fourth Proportional to 398,809, 550,362.99 and 217,520.94

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Solution

The fourth proportional to 398,809, 550,362.99 and 217,520.94 is: 300,182.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,809 : 550,362.99 = 217,520.94 : x
  2. Step 2: Convert to fraction form
    398,809/550,362.99 = 217,520.94/x
  3. Step 3: Cross multiply
    398,809x = 550,362.99 × 217,520.94
  4. Step 4: Simplify right side
    398,809x = 119,715,473,838.41
  5. Step 5: Solve for x
    x = 119,715,473,838.41/398,809
  6. Step 6: Final answer
    x = 300,182.48

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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.