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Finding the Fourth Proportional to 15,099.72, 20,836.08 and 8,815.74

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Solution

The fourth proportional to 15,099.72, 20,836.08 and 8,815.74 is: 12,164.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,099.72 : 20,836.08 = 8,815.74 : x
  2. Step 2: Convert to fraction form
    15,099.72/20,836.08 = 8,815.74/x
  3. Step 3: Cross multiply
    15,099.72x = 20,836.08 × 8,815.74
  4. Step 4: Simplify right side
    15,099.72x = 183,685,385.76
  5. Step 5: Solve for x
    x = 183,685,385.76/15,099.72
  6. Step 6: Final answer
    x = 12,164.82

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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.