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Finding the Fourth Proportional to 18,866.79, 28,305.45 and 5,719.28

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Solution

The fourth proportional to 18,866.79, 28,305.45 and 5,719.28 is: 8,580.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,866.79 : 28,305.45 = 5,719.28 : x
  2. Step 2: Convert to fraction form
    18,866.79/28,305.45 = 5,719.28/x
  3. Step 3: Cross multiply
    18,866.79x = 28,305.45 × 5,719.28
  4. Step 4: Simplify right side
    18,866.79x = 161,886,652.55
  5. Step 5: Solve for x
    x = 161,886,652.55/18,866.79
  6. Step 6: Final answer
    x = 8,580.51

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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.