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Finding the Fourth Proportional to 388,189.54, 535,577.92 and 218,390.86

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Solution

The fourth proportional to 388,189.54, 535,577.92 and 218,390.86 is: 301,309.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,189.54 : 535,577.92 = 218,390.86 : x
  2. Step 2: Convert to fraction form
    388,189.54/535,577.92 = 218,390.86/x
  3. Step 3: Cross multiply
    388,189.54x = 535,577.92 × 218,390.86
  4. Step 4: Simplify right side
    388,189.54x = 116,965,322,545.81
  5. Step 5: Solve for x
    x = 116,965,322,545.81/388,189.54
  6. Step 6: Final answer
    x = 301,309.83

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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.