Home / 13,515.72-20,269.80-5,719.20

Finding the Fourth Proportional to 13,515.72, 20,269.80 and 5,719.20

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Solution

The fourth proportional to 13,515.72, 20,269.80 and 5,719.20 is: 8,577.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,515.72 : 20,269.80 = 5,719.20 : x
  2. Step 2: Convert to fraction form
    13,515.72/20,269.80 = 5,719.20/x
  3. Step 3: Cross multiply
    13,515.72x = 20,269.80 × 5,719.20
  4. Step 4: Simplify right side
    13,515.72x = 115,927,040.16
  5. Step 5: Solve for x
    x = 115,927,040.16/13,515.72
  6. Step 6: Final answer
    x = 8,577.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.