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Finding the Fourth Proportional to 661,641.60, 991,976.40 and 262,084.80

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Solution

The fourth proportional to 661,641.60, 991,976.40 and 262,084.80 is: 392,934.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,641.60 : 991,976.40 = 262,084.80 : x
  2. Step 2: Convert to fraction form
    661,641.60/991,976.40 = 262,084.80/x
  3. Step 3: Cross multiply
    661,641.60x = 991,976.40 × 262,084.80
  4. Step 4: Simplify right side
    661,641.60x = 259,981,936,398.72
  5. Step 5: Solve for x
    x = 259,981,936,398.72/661,641.60
  6. Step 6: Final answer
    x = 392,934.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.