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Finding the Fourth Proportional to 388,149.78, 535,641.18 and 218,383.50

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Solution

The fourth proportional to 388,149.78, 535,641.18 and 218,383.50 is: 301,366.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,149.78 : 535,641.18 = 218,383.50 : x
  2. Step 2: Convert to fraction form
    388,149.78/535,641.18 = 218,383.50/x
  3. Step 3: Cross multiply
    388,149.78x = 535,641.18 × 218,383.50
  4. Step 4: Simplify right side
    388,149.78x = 116,975,195,632.53
  5. Step 5: Solve for x
    x = 116,975,195,632.53/388,149.78
  6. Step 6: Final answer
    x = 301,366.13

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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.