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Finding the Fourth Proportional to 388,302.78, 535,769.19 and 218,474.94

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Solution

The fourth proportional to 388,302.78, 535,769.19 and 218,474.94 is: 301,445.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,302.78 : 535,769.19 = 218,474.94 : x
  2. Step 2: Convert to fraction form
    388,302.78/535,769.19 = 218,474.94/x
  3. Step 3: Cross multiply
    388,302.78x = 535,769.19 × 218,474.94
  4. Step 4: Simplify right side
    388,302.78x = 117,052,141,639.10
  5. Step 5: Solve for x
    x = 117,052,141,639.10/388,302.78
  6. Step 6: Final answer
    x = 301,445.54

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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.