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Finding the Fourth Proportional to 398,993.15, 550,609.38 and 217,703.81

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Solution

The fourth proportional to 398,993.15, 550,609.38 and 217,703.81 is: 300,430.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,993.15 : 550,609.38 = 217,703.81 : x
  2. Step 2: Convert to fraction form
    398,993.15/550,609.38 = 217,703.81/x
  3. Step 3: Cross multiply
    398,993.15x = 550,609.38 × 217,703.81
  4. Step 4: Simplify right side
    398,993.15x = 119,869,761,224.26
  5. Step 5: Solve for x
    x = 119,869,761,224.26/398,993.15
  6. Step 6: Final answer
    x = 300,430.62

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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.