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Finding the Fourth Proportional to 20,989.08, 28,968.08 and 15,945

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Solution

The fourth proportional to 20,989.08, 28,968.08 and 15,945 is: 22,006.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.08 : 28,968.08 = 15,945 : x
  2. Step 2: Convert to fraction form
    20,989.08/28,968.08 = 15,945/x
  3. Step 3: Cross multiply
    20,989.08x = 28,968.08 × 15,945
  4. Step 4: Simplify right side
    20,989.08x = 461,896,035.60
  5. Step 5: Solve for x
    x = 461,896,035.60/20,989.08
  6. Step 6: Final answer
    x = 22,006.49

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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.