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Finding the Fourth Proportional to 205,861.40, 308,820.90 and 87,531.80

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Solution

The fourth proportional to 205,861.40, 308,820.90 and 87,531.80 is: 131,309.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,861.40 : 308,820.90 = 87,531.80 : x
  2. Step 2: Convert to fraction form
    205,861.40/308,820.90 = 87,531.80/x
  3. Step 3: Cross multiply
    205,861.40x = 308,820.90 × 87,531.80
  4. Step 4: Simplify right side
    205,861.40x = 27,031,649,254.62
  5. Step 5: Solve for x
    x = 27,031,649,254.62/205,861.40
  6. Step 6: Final answer
    x = 131,309.95

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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.