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Finding the Fourth Proportional to 393,866.34, 543,532.78 and 215,018.34

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Solution

The fourth proportional to 393,866.34, 543,532.78 and 215,018.34 is: 296,723.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,866.34 : 543,532.78 = 215,018.34 : x
  2. Step 2: Convert to fraction form
    393,866.34/543,532.78 = 215,018.34/x
  3. Step 3: Cross multiply
    393,866.34x = 543,532.78 × 215,018.34
  4. Step 4: Simplify right side
    393,866.34x = 116,869,516,091.19
  5. Step 5: Solve for x
    x = 116,869,516,091.19/393,866.34
  6. Step 6: Final answer
    x = 296,723.80

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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.