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Finding the Fourth Proportional to 199,708.72, 299,479.78 and 81,299.68

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Solution

The fourth proportional to 199,708.72, 299,479.78 and 81,299.68 is: 121,915.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,708.72 : 299,479.78 = 81,299.68 : x
  2. Step 2: Convert to fraction form
    199,708.72/299,479.78 = 81,299.68/x
  3. Step 3: Cross multiply
    199,708.72x = 299,479.78 × 81,299.68
  4. Step 4: Simplify right side
    199,708.72x = 24,347,610,280.47
  5. Step 5: Solve for x
    x = 24,347,610,280.47/199,708.72
  6. Step 6: Final answer
    x = 121,915.61

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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.