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Finding the Fourth Proportional to 18,865.71, 28,302.66 and 5,719.11

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Solution

The fourth proportional to 18,865.71, 28,302.66 and 5,719.11 is: 8,579.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,865.71 : 28,302.66 = 5,719.11 : x
  2. Step 2: Convert to fraction form
    18,865.71/28,302.66 = 5,719.11/x
  3. Step 3: Cross multiply
    18,865.71x = 28,302.66 × 5,719.11
  4. Step 4: Simplify right side
    18,865.71x = 161,866,025.83
  5. Step 5: Solve for x
    x = 161,866,025.83/18,865.71
  6. Step 6: Final answer
    x = 8,579.91

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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.