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Finding the Fourth Proportional to 72,145.80, 108,218.70 and 25,403.40

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Solution

The fourth proportional to 72,145.80, 108,218.70 and 25,403.40 is: 38,105.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,145.80 : 108,218.70 = 25,403.40 : x
  2. Step 2: Convert to fraction form
    72,145.80/108,218.70 = 25,403.40/x
  3. Step 3: Cross multiply
    72,145.80x = 108,218.70 × 25,403.40
  4. Step 4: Simplify right side
    72,145.80x = 2,749,122,923.58
  5. Step 5: Solve for x
    x = 2,749,122,923.58/72,145.80
  6. Step 6: Final answer
    x = 38,105.10

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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.