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Finding the Fourth Proportional to 81,051.20, 121,519.20 and 36,699.20

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Solution

The fourth proportional to 81,051.20, 121,519.20 and 36,699.20 is: 55,022.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,051.20 : 121,519.20 = 36,699.20 : x
  2. Step 2: Convert to fraction form
    81,051.20/121,519.20 = 36,699.20/x
  3. Step 3: Cross multiply
    81,051.20x = 121,519.20 × 36,699.20
  4. Step 4: Simplify right side
    81,051.20x = 4,459,657,424.64
  5. Step 5: Solve for x
    x = 4,459,657,424.64/81,051.20
  6. Step 6: Final answer
    x = 55,022.72

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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.