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Finding the Fourth Proportional to 218,907.72, 328,377.78 and 78,667.56

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Solution

The fourth proportional to 218,907.72, 328,377.78 and 78,667.56 is: 118,007.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,907.72 : 328,377.78 = 78,667.56 : x
  2. Step 2: Convert to fraction form
    218,907.72/328,377.78 = 78,667.56/x
  3. Step 3: Cross multiply
    218,907.72x = 328,377.78 × 78,667.56
  4. Step 4: Simplify right side
    218,907.72x = 25,832,678,710.82
  5. Step 5: Solve for x
    x = 25,832,678,710.82/218,907.72
  6. Step 6: Final answer
    x = 118,007.16

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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.