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Finding the Fourth Proportional to 81,300.60, 121,805.10 and 69,636.60

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Solution

The fourth proportional to 81,300.60, 121,805.10 and 69,636.60 is: 104,330.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,300.60 : 121,805.10 = 69,636.60 : x
  2. Step 2: Convert to fraction form
    81,300.60/121,805.10 = 69,636.60/x
  3. Step 3: Cross multiply
    81,300.60x = 121,805.10 × 69,636.60
  4. Step 4: Simplify right side
    81,300.60x = 8,482,093,026.66
  5. Step 5: Solve for x
    x = 8,482,093,026.66/81,300.60
  6. Step 6: Final answer
    x = 104,330.02

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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.