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Finding the Fourth Proportional to 108,639.30, 162,764.55 and 91,920.90

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Solution

The fourth proportional to 108,639.30, 162,764.55 and 91,920.90 is: 137,716.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,639.30 : 162,764.55 = 91,920.90 : x
  2. Step 2: Convert to fraction form
    108,639.30/162,764.55 = 91,920.90/x
  3. Step 3: Cross multiply
    108,639.30x = 162,764.55 × 91,920.90
  4. Step 4: Simplify right side
    108,639.30x = 14,961,463,924.10
  5. Step 5: Solve for x
    x = 14,961,463,924.10/108,639.30
  6. Step 6: Final answer
    x = 137,716.87

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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.