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Finding the Fourth Proportional to 399,063.89, 550,706.86 and 217,775.81

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Solution

The fourth proportional to 399,063.89, 550,706.86 and 217,775.81 is: 300,529.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,063.89 : 550,706.86 = 217,775.81 : x
  2. Step 2: Convert to fraction form
    399,063.89/550,706.86 = 217,775.81/x
  3. Step 3: Cross multiply
    399,063.89x = 550,706.86 × 217,775.81
  4. Step 4: Simplify right side
    399,063.89x = 119,930,632,509.06
  5. Step 5: Solve for x
    x = 119,930,632,509.06/399,063.89
  6. Step 6: Final answer
    x = 300,529.90

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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.