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Finding the Fourth Proportional to 12,579.50, 17,359.72 and 6,990.50

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Solution

The fourth proportional to 12,579.50, 17,359.72 and 6,990.50 is: 9,646.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,579.50 : 17,359.72 = 6,990.50 : x
  2. Step 2: Convert to fraction form
    12,579.50/17,359.72 = 6,990.50/x
  3. Step 3: Cross multiply
    12,579.50x = 17,359.72 × 6,990.50
  4. Step 4: Simplify right side
    12,579.50x = 121,353,122.66
  5. Step 5: Solve for x
    x = 121,353,122.66/12,579.50
  6. Step 6: Final answer
    x = 9,646.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.