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Finding the Fourth Proportional to 72,115.20, 108,205.20 and 25,401.60

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Solution

The fourth proportional to 72,115.20, 108,205.20 and 25,401.60 is: 38,113.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,115.20 : 108,205.20 = 25,401.60 : x
  2. Step 2: Convert to fraction form
    72,115.20/108,205.20 = 25,401.60/x
  3. Step 3: Cross multiply
    72,115.20x = 108,205.20 × 25,401.60
  4. Step 4: Simplify right side
    72,115.20x = 2,748,585,208.32
  5. Step 5: Solve for x
    x = 2,748,585,208.32/72,115.20
  6. Step 6: Final answer
    x = 38,113.81

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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.