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Finding the Fourth Proportional to 12,656.26, 18,995.94 and 6,420.56

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Solution

The fourth proportional to 12,656.26, 18,995.94 and 6,420.56 is: 9,636.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,656.26 : 18,995.94 = 6,420.56 : x
  2. Step 2: Convert to fraction form
    12,656.26/18,995.94 = 6,420.56/x
  3. Step 3: Cross multiply
    12,656.26x = 18,995.94 × 6,420.56
  4. Step 4: Simplify right side
    12,656.26x = 121,964,572.53
  5. Step 5: Solve for x
    x = 121,964,572.53/12,656.26
  6. Step 6: Final answer
    x = 9,636.70

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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.