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Finding the Fourth Proportional to 8,651.52, 12,978 and 5,210.64

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Solution

The fourth proportional to 8,651.52, 12,978 and 5,210.64 is: 7,816.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,651.52 : 12,978 = 5,210.64 : x
  2. Step 2: Convert to fraction form
    8,651.52/12,978 = 5,210.64/x
  3. Step 3: Cross multiply
    8,651.52x = 12,978 × 5,210.64
  4. Step 4: Simplify right side
    8,651.52x = 67,623,685.92
  5. Step 5: Solve for x
    x = 67,623,685.92/8,651.52
  6. Step 6: Final answer
    x = 7,816.39

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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.