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Finding the Fourth Proportional to 81,208.60, 121,640.10 and 67,384.60

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Solution

The fourth proportional to 81,208.60, 121,640.10 and 67,384.60 is: 100,933.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,208.60 : 121,640.10 = 67,384.60 : x
  2. Step 2: Convert to fraction form
    81,208.60/121,640.10 = 67,384.60/x
  3. Step 3: Cross multiply
    81,208.60x = 121,640.10 × 67,384.60
  4. Step 4: Simplify right side
    81,208.60x = 8,196,669,482.46
  5. Step 5: Solve for x
    x = 8,196,669,482.46/81,208.60
  6. Step 6: Final answer
    x = 100,933.52

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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.