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Finding the Fourth Proportional to 18,871.60, 28,300.20 and 5,719.60

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Solution

The fourth proportional to 18,871.60, 28,300.20 and 5,719.60 is: 8,577.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.60 : 28,300.20 = 5,719.60 : x
  2. Step 2: Convert to fraction form
    18,871.60/28,300.20 = 5,719.60/x
  3. Step 3: Cross multiply
    18,871.60x = 28,300.20 × 5,719.60
  4. Step 4: Simplify right side
    18,871.60x = 161,865,823.92
  5. Step 5: Solve for x
    x = 161,865,823.92/18,871.60
  6. Step 6: Final answer
    x = 8,577.22

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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.