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Finding the Fourth Proportional to 398,979.97, 550,674.31 and 243,957.77

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Solution

The fourth proportional to 398,979.97, 550,674.31 and 243,957.77 is: 336,711.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,979.97 : 550,674.31 = 243,957.77 : x
  2. Step 2: Convert to fraction form
    398,979.97/550,674.31 = 243,957.77/x
  3. Step 3: Cross multiply
    398,979.97x = 550,674.31 × 243,957.77
  4. Step 4: Simplify right side
    398,979.97x = 134,341,276,663.89
  5. Step 5: Solve for x
    x = 134,341,276,663.89/398,979.97
  6. Step 6: Final answer
    x = 336,711.83

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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.