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Finding the Fourth Proportional to 72,930.80, 100,644.48 and 39,396.80

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Solution

The fourth proportional to 72,930.80, 100,644.48 and 39,396.80 is: 54,367.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,930.80 : 100,644.48 = 39,396.80 : x
  2. Step 2: Convert to fraction form
    72,930.80/100,644.48 = 39,396.80/x
  3. Step 3: Cross multiply
    72,930.80x = 100,644.48 × 39,396.80
  4. Step 4: Simplify right side
    72,930.80x = 3,965,070,449.66
  5. Step 5: Solve for x
    x = 3,965,070,449.66/72,930.80
  6. Step 6: Final answer
    x = 54,367.57

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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.