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Finding the Fourth Proportional to 193,340.80, 289,780.80 and 81,020.80

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Solution

The fourth proportional to 193,340.80, 289,780.80 and 81,020.80 is: 121,434.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    193,340.80 : 289,780.80 = 81,020.80 : x
  2. Step 2: Convert to fraction form
    193,340.80/289,780.80 = 81,020.80/x
  3. Step 3: Cross multiply
    193,340.80x = 289,780.80 × 81,020.80
  4. Step 4: Simplify right side
    193,340.80x = 23,478,272,240.64
  5. Step 5: Solve for x
    x = 23,478,272,240.64/193,340.80
  6. Step 6: Final answer
    x = 121,434.65

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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.