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Finding the Fourth Proportional to 81,202.40, 121,803.60 and 53,208.80

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Solution

The fourth proportional to 81,202.40, 121,803.60 and 53,208.80 is: 79,813.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,202.40 : 121,803.60 = 53,208.80 : x
  2. Step 2: Convert to fraction form
    81,202.40/121,803.60 = 53,208.80/x
  3. Step 3: Cross multiply
    81,202.40x = 121,803.60 × 53,208.80
  4. Step 4: Simplify right side
    81,202.40x = 6,481,023,391.68
  5. Step 5: Solve for x
    x = 6,481,023,391.68/81,202.40
  6. Step 6: Final answer
    x = 79,813.20

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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.