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Finding the Fourth Proportional to 15,115.97, 20,861.57 and 8,828.93

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Solution

The fourth proportional to 15,115.97, 20,861.57 and 8,828.93 is: 12,184.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,115.97 : 20,861.57 = 8,828.93 : x
  2. Step 2: Convert to fraction form
    15,115.97/20,861.57 = 8,828.93/x
  3. Step 3: Cross multiply
    15,115.97x = 20,861.57 × 8,828.93
  4. Step 4: Simplify right side
    15,115.97x = 184,185,341.22
  5. Step 5: Solve for x
    x = 184,185,341.22/15,115.97
  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.