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Finding the Fourth Proportional to 13,719.77, 20,579.19 and 5,817.20

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Solution

The fourth proportional to 13,719.77, 20,579.19 and 5,817.20 is: 8,725.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,719.77 : 20,579.19 = 5,817.20 : x
  2. Step 2: Convert to fraction form
    13,719.77/20,579.19 = 5,817.20/x
  3. Step 3: Cross multiply
    13,719.77x = 20,579.19 × 5,817.20
  4. Step 4: Simplify right side
    13,719.77x = 119,713,278.61
  5. Step 5: Solve for x
    x = 119,713,278.61/13,719.77
  6. Step 6: Final answer
    x = 8,725.60

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1.5x scale

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.