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Finding the Fourth Proportional to 12,553.53, 18,805.95 and 6,990

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Solution

The fourth proportional to 12,553.53, 18,805.95 and 6,990 is: 10,471.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,553.53 : 18,805.95 = 6,990 : x
  2. Step 2: Convert to fraction form
    12,553.53/18,805.95 = 6,990/x
  3. Step 3: Cross multiply
    12,553.53x = 18,805.95 × 6,990
  4. Step 4: Simplify right side
    12,553.53x = 131,453,590.50
  5. Step 5: Solve for x
    x = 131,453,590.50/12,553.53
  6. Step 6: Final answer
    x = 10,471.44

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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.