Home / 15,331.78-21,156.81-8,618.42

Finding the Fourth Proportional to 15,331.78, 21,156.81 and 8,618.42

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Solution

The fourth proportional to 15,331.78, 21,156.81 and 8,618.42 is: 11,892.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,331.78 : 21,156.81 = 8,618.42 : x
  2. Step 2: Convert to fraction form
    15,331.78/21,156.81 = 8,618.42/x
  3. Step 3: Cross multiply
    15,331.78x = 21,156.81 × 8,618.42
  4. Step 4: Simplify right side
    15,331.78x = 182,338,295.01
  5. Step 5: Solve for x
    x = 182,338,295.01/15,331.78
  6. Step 6: Final answer
    x = 11,892.83

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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.