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Finding the Fourth Proportional to 18,865.92, 28,303.12 and 5,718.40

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Solution

The fourth proportional to 18,865.92, 28,303.12 and 5,718.40 is: 8,578.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,865.92 : 28,303.12 = 5,718.40 : x
  2. Step 2: Convert to fraction form
    18,865.92/28,303.12 = 5,718.40/x
  3. Step 3: Cross multiply
    18,865.92x = 28,303.12 × 5,718.40
  4. Step 4: Simplify right side
    18,865.92x = 161,848,561.41
  5. Step 5: Solve for x
    x = 161,848,561.41/18,865.92
  6. Step 6: Final answer
    x = 8,578.89

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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.