Home / 15,621.28-21,555.60-9,331.36

Finding the Fourth Proportional to 15,621.28, 21,555.60 and 9,331.36

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Solution

The fourth proportional to 15,621.28, 21,555.60 and 9,331.36 is: 12,876.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,621.28 : 21,555.60 = 9,331.36 : x
  2. Step 2: Convert to fraction form
    15,621.28/21,555.60 = 9,331.36/x
  3. Step 3: Cross multiply
    15,621.28x = 21,555.60 × 9,331.36
  4. Step 4: Simplify right side
    15,621.28x = 201,143,063.62
  5. Step 5: Solve for x
    x = 201,143,063.62/15,621.28
  6. Step 6: Final answer
    x = 12,876.22

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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.