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Finding the Fourth Proportional to 15,115.98, 20,861.56 and 8,828.94

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Solution

The fourth proportional to 15,115.98, 20,861.56 and 8,828.94 is: 12,184.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,115.98 : 20,861.56 = 8,828.94 : x
  2. Step 2: Convert to fraction form
    15,115.98/20,861.56 = 8,828.94/x
  3. Step 3: Cross multiply
    15,115.98x = 20,861.56 × 8,828.94
  4. Step 4: Simplify right side
    15,115.98x = 184,185,461.55
  5. Step 5: Solve for x
    x = 184,185,461.55/15,115.98
  6. Step 6: Final answer
    x = 12,184.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.