Home / 15,505.28-21,396.69-8,431.71

Finding the Fourth Proportional to 15,505.28, 21,396.69 and 8,431.71

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Solution

The fourth proportional to 15,505.28, 21,396.69 and 8,431.71 is: 11,635.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,505.28 : 21,396.69 = 8,431.71 : x
  2. Step 2: Convert to fraction form
    15,505.28/21,396.69 = 8,431.71/x
  3. Step 3: Cross multiply
    15,505.28x = 21,396.69 × 8,431.71
  4. Step 4: Simplify right side
    15,505.28x = 180,410,685.04
  5. Step 5: Solve for x
    x = 180,410,685.04/15,505.28
  6. Step 6: Final answer
    x = 11,635.44

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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.