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Finding the Fourth Proportional to 388,122.69, 535,615.36 and 216,042.54

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Solution

The fourth proportional to 388,122.69, 535,615.36 and 216,042.54 is: 298,142.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,122.69 : 535,615.36 = 216,042.54 : x
  2. Step 2: Convert to fraction form
    388,122.69/535,615.36 = 216,042.54/x
  3. Step 3: Cross multiply
    388,122.69x = 535,615.36 × 216,042.54
  4. Step 4: Simplify right side
    388,122.69x = 115,715,702,297.31
  5. Step 5: Solve for x
    x = 115,715,702,297.31/388,122.69
  6. Step 6: Final answer
    x = 298,142.07

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1.5x scale

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.