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Finding the Fourth Proportional to 73,728.80, 110,593.20 and 21,143.60

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Solution

The fourth proportional to 73,728.80, 110,593.20 and 21,143.60 is: 31,715.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,728.80 : 110,593.20 = 21,143.60 : x
  2. Step 2: Convert to fraction form
    73,728.80/110,593.20 = 21,143.60/x
  3. Step 3: Cross multiply
    73,728.80x = 110,593.20 × 21,143.60
  4. Step 4: Simplify right side
    73,728.80x = 2,338,338,383.52
  5. Step 5: Solve for x
    x = 2,338,338,383.52/73,728.80
  6. Step 6: Final answer
    x = 31,715.40

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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.