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Finding the Fourth Proportional to 11,989.01, 17,988.70 and 6,435.87

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Solution

The fourth proportional to 11,989.01, 17,988.70 and 6,435.87 is: 9,656.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,989.01 : 17,988.70 = 6,435.87 : x
  2. Step 2: Convert to fraction form
    11,989.01/17,988.70 = 6,435.87/x
  3. Step 3: Cross multiply
    11,989.01x = 17,988.70 × 6,435.87
  4. Step 4: Simplify right side
    11,989.01x = 115,772,861.33
  5. Step 5: Solve for x
    x = 115,772,861.33/11,989.01
  6. Step 6: Final answer
    x = 9,656.58

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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.