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Finding the Fourth Proportional to 15,156.95, 20,917.17 and 8,783.75

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Solution

The fourth proportional to 15,156.95, 20,917.17 and 8,783.75 is: 12,121.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,156.95 : 20,917.17 = 8,783.75 : x
  2. Step 2: Convert to fraction form
    15,156.95/20,917.17 = 8,783.75/x
  3. Step 3: Cross multiply
    15,156.95x = 20,917.17 × 8,783.75
  4. Step 4: Simplify right side
    15,156.95x = 183,731,191.99
  5. Step 5: Solve for x
    x = 183,731,191.99/15,156.95
  6. Step 6: Final answer
    x = 12,121.91

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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.