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Finding the Fourth Proportional to 73,178.25, 100,986.39 and 39,644.25

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Solution

The fourth proportional to 73,178.25, 100,986.39 and 39,644.25 is: 54,709.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,178.25 : 100,986.39 = 39,644.25 : x
  2. Step 2: Convert to fraction form
    73,178.25/100,986.39 = 39,644.25/x
  3. Step 3: Cross multiply
    73,178.25x = 100,986.39 × 39,644.25
  4. Step 4: Simplify right side
    73,178.25x = 4,003,529,691.76
  5. Step 5: Solve for x
    x = 4,003,529,691.76/73,178.25
  6. Step 6: Final answer
    x = 54,709.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.