Home / 81,208.20-121,812.30-53,214.60

Finding the Fourth Proportional to 81,208.20, 121,812.30 and 53,214.60

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Solution

The fourth proportional to 81,208.20, 121,812.30 and 53,214.60 is: 79,821.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,208.20 : 121,812.30 = 53,214.60 : x
  2. Step 2: Convert to fraction form
    81,208.20/121,812.30 = 53,214.60/x
  3. Step 3: Cross multiply
    81,208.20x = 121,812.30 × 53,214.60
  4. Step 4: Simplify right side
    81,208.20x = 6,482,192,819.58
  5. Step 5: Solve for x
    x = 6,482,192,819.58/81,208.20
  6. Step 6: Final answer
    x = 79,821.90

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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.