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Finding the Fourth Proportional to 15,222.16, 21,006.52 and 8,507.78

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Solution

The fourth proportional to 15,222.16, 21,006.52 and 8,507.78 is: 11,740.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,222.16 : 21,006.52 = 8,507.78 : x
  2. Step 2: Convert to fraction form
    15,222.16/21,006.52 = 8,507.78/x
  3. Step 3: Cross multiply
    15,222.16x = 21,006.52 × 8,507.78
  4. Step 4: Simplify right side
    15,222.16x = 178,718,850.73
  5. Step 5: Solve for x
    x = 178,718,850.73/15,222.16
  6. Step 6: Final answer
    x = 11,740.70

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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.