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Finding the Fourth Proportional to 100,562.45, 138,736.50 and 64,773.21

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Solution

The fourth proportional to 100,562.45, 138,736.50 and 64,773.21 is: 89,361.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,562.45 : 138,736.50 = 64,773.21 : x
  2. Step 2: Convert to fraction form
    100,562.45/138,736.50 = 64,773.21/x
  3. Step 3: Cross multiply
    100,562.45x = 138,736.50 × 64,773.21
  4. Step 4: Simplify right side
    100,562.45x = 8,986,408,449.17
  5. Step 5: Solve for x
    x = 8,986,408,449.17/100,562.45
  6. Step 6: Final answer
    x = 89,361.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.