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Finding the Fourth Proportional to 20,569.66, 30,850.94 and 7,420.12

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Solution

The fourth proportional to 20,569.66, 30,850.94 and 7,420.12 is: 11,128.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,569.66 : 30,850.94 = 7,420.12 : x
  2. Step 2: Convert to fraction form
    20,569.66/30,850.94 = 7,420.12/x
  3. Step 3: Cross multiply
    20,569.66x = 30,850.94 × 7,420.12
  4. Step 4: Simplify right side
    20,569.66x = 228,917,676.91
  5. Step 5: Solve for x
    x = 228,917,676.91/20,569.66
  6. Step 6: Final answer
    x = 11,128.90

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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.