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Finding the Fourth Proportional to 20,663.70, 30,978.13 and 8,968.11

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Solution

The fourth proportional to 20,663.70, 30,978.13 and 8,968.11 is: 13,444.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,663.70 : 30,978.13 = 8,968.11 : x
  2. Step 2: Convert to fraction form
    20,663.70/30,978.13 = 8,968.11/x
  3. Step 3: Cross multiply
    20,663.70x = 30,978.13 × 8,968.11
  4. Step 4: Simplify right side
    20,663.70x = 277,815,277.43
  5. Step 5: Solve for x
    x = 277,815,277.43/20,663.70
  6. Step 6: Final answer
    x = 13,444.60

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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.