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Finding the Fourth Proportional to 72,622.60, 108,972.60 and 28,250.80

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Solution

The fourth proportional to 72,622.60, 108,972.60 and 28,250.80 is: 42,391.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,622.60 : 108,972.60 = 28,250.80 : x
  2. Step 2: Convert to fraction form
    72,622.60/108,972.60 = 28,250.80/x
  3. Step 3: Cross multiply
    72,622.60x = 108,972.60 × 28,250.80
  4. Step 4: Simplify right side
    72,622.60x = 3,078,563,128.08
  5. Step 5: Solve for x
    x = 3,078,563,128.08/72,622.60
  6. Step 6: Final answer
    x = 42,391.25

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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.