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Finding the Fourth Proportional to 18,866.80, 28,300.20 and 5,718.52

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Solution

The fourth proportional to 18,866.80, 28,300.20 and 5,718.52 is: 8,577.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,866.80 : 28,300.20 = 5,718.52 : x
  2. Step 2: Convert to fraction form
    18,866.80/28,300.20 = 5,718.52/x
  3. Step 3: Cross multiply
    18,866.80x = 28,300.20 × 5,718.52
  4. Step 4: Simplify right side
    18,866.80x = 161,835,259.70
  5. Step 5: Solve for x
    x = 161,835,259.70/18,866.80
  6. Step 6: Final answer
    x = 8,577.78

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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.