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Finding the Fourth Proportional to 388,021.34, 535,463.96 and 218,255.42

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Solution

The fourth proportional to 388,021.34, 535,463.96 and 218,255.42 is: 301,189.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,021.34 : 535,463.96 = 218,255.42 : x
  2. Step 2: Convert to fraction form
    388,021.34/535,463.96 = 218,255.42/x
  3. Step 3: Cross multiply
    388,021.34x = 535,463.96 × 218,255.42
  4. Step 4: Simplify right side
    388,021.34x = 116,867,911,484.66
  5. Step 5: Solve for x
    x = 116,867,911,484.66/388,021.34
  6. Step 6: Final answer
    x = 301,189.39

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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.