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Finding the Fourth Proportional to 20,646.72, 30,978.28 and 6,608.90

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Solution

The fourth proportional to 20,646.72, 30,978.28 and 6,608.90 is: 9,915.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,646.72 : 30,978.28 = 6,608.90 : x
  2. Step 2: Convert to fraction form
    20,646.72/30,978.28 = 6,608.90/x
  3. Step 3: Cross multiply
    20,646.72x = 30,978.28 × 6,608.90
  4. Step 4: Simplify right side
    20,646.72x = 204,732,354.69
  5. Step 5: Solve for x
    x = 204,732,354.69/20,646.72
  6. Step 6: Final answer
    x = 9,915.97

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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.