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Finding the Fourth Proportional to 205,881.60, 308,836.80 and 81,206.40

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Solution

The fourth proportional to 205,881.60, 308,836.80 and 81,206.40 is: 121,815.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,881.60 : 308,836.80 = 81,206.40 : x
  2. Step 2: Convert to fraction form
    205,881.60/308,836.80 = 81,206.40/x
  3. Step 3: Cross multiply
    205,881.60x = 308,836.80 × 81,206.40
  4. Step 4: Simplify right side
    205,881.60x = 25,079,524,715.52
  5. Step 5: Solve for x
    x = 25,079,524,715.52/205,881.60
  6. Step 6: Final answer
    x = 121,815.28

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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.