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Finding the Fourth Proportional to 81,200.60, 121,655.10 and 69,536.60

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Solution

The fourth proportional to 81,200.60, 121,655.10 and 69,536.60 is: 104,180.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,200.60 : 121,655.10 = 69,536.60 : x
  2. Step 2: Convert to fraction form
    81,200.60/121,655.10 = 69,536.60/x
  3. Step 3: Cross multiply
    81,200.60x = 121,655.10 × 69,536.60
  4. Step 4: Simplify right side
    81,200.60x = 8,459,482,026.66
  5. Step 5: Solve for x
    x = 8,459,482,026.66/81,200.60
  6. Step 6: Final answer
    x = 104,180.04

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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.