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Finding the Fourth Proportional to 20,793.91, 31,203.21 and 7,655.51

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Solution

The fourth proportional to 20,793.91, 31,203.21 and 7,655.51 is: 11,487.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,793.91 : 31,203.21 = 7,655.51 : x
  2. Step 2: Convert to fraction form
    20,793.91/31,203.21 = 7,655.51/x
  3. Step 3: Cross multiply
    20,793.91x = 31,203.21 × 7,655.51
  4. Step 4: Simplify right side
    20,793.91x = 238,876,330.17
  5. Step 5: Solve for x
    x = 238,876,330.17/20,793.91
  6. Step 6: Final answer
    x = 11,487.81

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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.