Home / 15,309.92-21,121.08-9,640.20

Finding the Fourth Proportional to 15,309.92, 21,121.08 and 9,640.20

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Solution

The fourth proportional to 15,309.92, 21,121.08 and 9,640.20 is: 13,299.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,309.92 : 21,121.08 = 9,640.20 : x
  2. Step 2: Convert to fraction form
    15,309.92/21,121.08 = 9,640.20/x
  3. Step 3: Cross multiply
    15,309.92x = 21,121.08 × 9,640.20
  4. Step 4: Simplify right side
    15,309.92x = 203,611,435.42
  5. Step 5: Solve for x
    x = 203,611,435.42/15,309.92
  6. Step 6: Final answer
    x = 13,299.31

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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.