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Finding the Fourth Proportional to 12,399.78, 17,111.67 and 6,810.78

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Solution

The fourth proportional to 12,399.78, 17,111.67 and 6,810.78 is: 9,398.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,399.78 : 17,111.67 = 6,810.78 : x
  2. Step 2: Convert to fraction form
    12,399.78/17,111.67 = 6,810.78/x
  3. Step 3: Cross multiply
    12,399.78x = 17,111.67 × 6,810.78
  4. Step 4: Simplify right side
    12,399.78x = 116,543,819.80
  5. Step 5: Solve for x
    x = 116,543,819.80/12,399.78
  6. Step 6: Final answer
    x = 9,398.86

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1.5x scale

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.