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Finding the Fourth Proportional to 8,636.80, 12,931.44 and 6,550.64

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Solution

The fourth proportional to 8,636.80, 12,931.44 and 6,550.64 is: 9,807.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,636.80 : 12,931.44 = 6,550.64 : x
  2. Step 2: Convert to fraction form
    8,636.80/12,931.44 = 6,550.64/x
  3. Step 3: Cross multiply
    8,636.80x = 12,931.44 × 6,550.64
  4. Step 4: Simplify right side
    8,636.80x = 84,709,208.12
  5. Step 5: Solve for x
    x = 84,709,208.12/8,636.80
  6. Step 6: Final answer
    x = 9,807.94

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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.