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Finding the Fourth Proportional to 20,764.60, 31,146.90 and 7,612.60

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Solution

The fourth proportional to 20,764.60, 31,146.90 and 7,612.60 is: 11,418.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,764.60 : 31,146.90 = 7,612.60 : x
  2. Step 2: Convert to fraction form
    20,764.60/31,146.90 = 7,612.60/x
  3. Step 3: Cross multiply
    20,764.60x = 31,146.90 × 7,612.60
  4. Step 4: Simplify right side
    20,764.60x = 237,108,890.94
  5. Step 5: Solve for x
    x = 237,108,890.94/20,764.60
  6. Step 6: Final answer
    x = 11,418.90

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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.