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Finding the Fourth Proportional to 18,719.28, 28,079.19 and 4,679.28

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Solution

The fourth proportional to 18,719.28, 28,079.19 and 4,679.28 is: 7,018.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.28 : 28,079.19 = 4,679.28 : x
  2. Step 2: Convert to fraction form
    18,719.28/28,079.19 = 4,679.28/x
  3. Step 3: Cross multiply
    18,719.28x = 28,079.19 × 4,679.28
  4. Step 4: Simplify right side
    18,719.28x = 131,390,392.18
  5. Step 5: Solve for x
    x = 131,390,392.18/18,719.28
  6. Step 6: Final answer
    x = 7,018.99

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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.