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Finding the Fourth Proportional to 379,816.80, 569,368.80 and 143,318.40

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Solution

The fourth proportional to 379,816.80, 569,368.80 and 143,318.40 is: 214,843.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    379,816.80 : 569,368.80 = 143,318.40 : x
  2. Step 2: Convert to fraction form
    379,816.80/569,368.80 = 143,318.40/x
  3. Step 3: Cross multiply
    379,816.80x = 569,368.80 × 143,318.40
  4. Step 4: Simplify right side
    379,816.80x = 81,601,025,425.92
  5. Step 5: Solve for x
    x = 81,601,025,425.92/379,816.80
  6. Step 6: Final answer
    x = 214,843.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.