Home / 20,861.02-31,260.12-12,531.88

Finding the Fourth Proportional to 20,861.02, 31,260.12 and 12,531.88

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Solution

The fourth proportional to 20,861.02, 31,260.12 and 12,531.88 is: 18,778.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.02 : 31,260.12 = 12,531.88 : x
  2. Step 2: Convert to fraction form
    20,861.02/31,260.12 = 12,531.88/x
  3. Step 3: Cross multiply
    20,861.02x = 31,260.12 × 12,531.88
  4. Step 4: Simplify right side
    20,861.02x = 391,748,072.63
  5. Step 5: Solve for x
    x = 391,748,072.63/20,861.02
  6. Step 6: Final answer
    x = 18,778.95

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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.