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Finding the Fourth Proportional to 388,190.54, 535,579.30 and 218,391.86

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Solution

The fourth proportional to 388,190.54, 535,579.30 and 218,391.86 is: 301,311.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,190.54 : 535,579.30 = 218,391.86 : x
  2. Step 2: Convert to fraction form
    388,190.54/535,579.30 = 218,391.86/x
  3. Step 3: Cross multiply
    388,190.54x = 535,579.30 × 218,391.86
  4. Step 4: Simplify right side
    388,190.54x = 116,966,159,504.50
  5. Step 5: Solve for x
    x = 116,966,159,504.50/388,190.54
  6. Step 6: Final answer
    x = 301,311.21

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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.