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Finding the Fourth Proportional to 11,991.78, 17,989.20 and 6,437.51

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Solution

The fourth proportional to 11,991.78, 17,989.20 and 6,437.51 is: 9,657.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,991.78 : 17,989.20 = 6,437.51 : x
  2. Step 2: Convert to fraction form
    11,991.78/17,989.20 = 6,437.51/x
  3. Step 3: Cross multiply
    11,991.78x = 17,989.20 × 6,437.51
  4. Step 4: Simplify right side
    11,991.78x = 115,805,564.95
  5. Step 5: Solve for x
    x = 115,805,564.95/11,991.78
  6. Step 6: Final answer
    x = 9,657.08

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1.5x scale

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.