Home / 15,399.28-21,247.08-9,428.80

Finding the Fourth Proportional to 15,399.28, 21,247.08 and 9,428.80

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Solution

The fourth proportional to 15,399.28, 21,247.08 and 9,428.80 is: 13,009.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,399.28 : 21,247.08 = 9,428.80 : x
  2. Step 2: Convert to fraction form
    15,399.28/21,247.08 = 9,428.80/x
  3. Step 3: Cross multiply
    15,399.28x = 21,247.08 × 9,428.80
  4. Step 4: Simplify right side
    15,399.28x = 200,334,467.90
  5. Step 5: Solve for x
    x = 200,334,467.90/15,399.28
  6. Step 6: Final answer
    x = 13,009.34

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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.