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Finding the Fourth Proportional to 388,008.78, 535,446.63 and 218,242.50

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Solution

The fourth proportional to 388,008.78, 535,446.63 and 218,242.50 is: 301,171.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,008.78 : 535,446.63 = 218,242.50 : x
  2. Step 2: Convert to fraction form
    388,008.78/535,446.63 = 218,242.50/x
  3. Step 3: Cross multiply
    388,008.78x = 535,446.63 × 218,242.50
  4. Step 4: Simplify right side
    388,008.78x = 116,857,211,147.78
  5. Step 5: Solve for x
    x = 116,857,211,147.78/388,008.78
  6. Step 6: Final answer
    x = 301,171.56

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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.