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Finding the Fourth Proportional to 15,697.78, 21,656.67 and 8,982.10

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Solution

The fourth proportional to 15,697.78, 21,656.67 and 8,982.10 is: 12,391.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,697.78 : 21,656.67 = 8,982.10 : x
  2. Step 2: Convert to fraction form
    15,697.78/21,656.67 = 8,982.10/x
  3. Step 3: Cross multiply
    15,697.78x = 21,656.67 × 8,982.10
  4. Step 4: Simplify right side
    15,697.78x = 194,522,375.61
  5. Step 5: Solve for x
    x = 194,522,375.61/15,697.78
  6. Step 6: Final answer
    x = 12,391.71

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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.