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Finding the Fourth Proportional to 8,919.20, 13,353.20 and 8,663.20

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Solution

The fourth proportional to 8,919.20, 13,353.20 and 8,663.20 is: 12,969.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.20 : 13,353.20 = 8,663.20 : x
  2. Step 2: Convert to fraction form
    8,919.20/13,353.20 = 8,663.20/x
  3. Step 3: Cross multiply
    8,919.20x = 13,353.20 × 8,663.20
  4. Step 4: Simplify right side
    8,919.20x = 115,681,442.24
  5. Step 5: Solve for x
    x = 115,681,442.24/8,919.20
  6. Step 6: Final answer
    x = 12,969.93

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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.