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Finding the Fourth Proportional to 387,161.71, 534,265.79 and 215,091.72

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Solution

The fourth proportional to 387,161.71, 534,265.79 and 215,091.72 is: 296,816.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,161.71 : 534,265.79 = 215,091.72 : x
  2. Step 2: Convert to fraction form
    387,161.71/534,265.79 = 215,091.72/x
  3. Step 3: Cross multiply
    387,161.71x = 534,265.79 × 215,091.72
  4. Step 4: Simplify right side
    387,161.71x = 114,916,146,632.80
  5. Step 5: Solve for x
    x = 114,916,146,632.80/387,161.71
  6. Step 6: Final answer
    x = 296,816.92

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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.