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Finding the Fourth Proportional to 72,468.80, 108,703.20 and 19,883.60

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Solution

The fourth proportional to 72,468.80, 108,703.20 and 19,883.60 is: 29,825.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,468.80 : 108,703.20 = 19,883.60 : x
  2. Step 2: Convert to fraction form
    72,468.80/108,703.20 = 19,883.60/x
  3. Step 3: Cross multiply
    72,468.80x = 108,703.20 × 19,883.60
  4. Step 4: Simplify right side
    72,468.80x = 2,161,410,947.52
  5. Step 5: Solve for x
    x = 2,161,410,947.52/72,468.80
  6. Step 6: Final answer
    x = 29,825.40

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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.