Home / 15,156.52-20,912.78-8,780.81

Finding the Fourth Proportional to 15,156.52, 20,912.78 and 8,780.81

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Solution

The fourth proportional to 15,156.52, 20,912.78 and 8,780.81 is: 12,115.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,156.52 : 20,912.78 = 8,780.81 : x
  2. Step 2: Convert to fraction form
    15,156.52/20,912.78 = 8,780.81/x
  3. Step 3: Cross multiply
    15,156.52x = 20,912.78 × 8,780.81
  4. Step 4: Simplify right side
    15,156.52x = 183,631,065.14
  5. Step 5: Solve for x
    x = 183,631,065.14/15,156.52
  6. Step 6: Final answer
    x = 12,115.65

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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.