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Finding the Fourth Proportional to 72,628.60, 108,981.60 and 28,256.80

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Solution

The fourth proportional to 72,628.60, 108,981.60 and 28,256.80 is: 42,400.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,628.60 : 108,981.60 = 28,256.80 : x
  2. Step 2: Convert to fraction form
    72,628.60/108,981.60 = 28,256.80/x
  3. Step 3: Cross multiply
    72,628.60x = 108,981.60 × 28,256.80
  4. Step 4: Simplify right side
    72,628.60x = 3,079,471,274.88
  5. Step 5: Solve for x
    x = 3,079,471,274.88/72,628.60
  6. Step 6: Final answer
    x = 42,400.26

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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.