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Finding the Fourth Proportional to 81,130.20, 121,606.20 and 28,512.60

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Solution

The fourth proportional to 81,130.20, 121,606.20 and 28,512.60 is: 42,737.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,130.20 : 121,606.20 = 28,512.60 : x
  2. Step 2: Convert to fraction form
    81,130.20/121,606.20 = 28,512.60/x
  3. Step 3: Cross multiply
    81,130.20x = 121,606.20 × 28,512.60
  4. Step 4: Simplify right side
    81,130.20x = 3,467,308,938.12
  5. Step 5: Solve for x
    x = 3,467,308,938.12/81,130.20
  6. Step 6: Final answer
    x = 42,737.59

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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.