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Finding the Fourth Proportional to 100,639.84, 138,885.36 and 55,317.48

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Solution

The fourth proportional to 100,639.84, 138,885.36 and 55,317.48 is: 76,339.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,639.84 : 138,885.36 = 55,317.48 : x
  2. Step 2: Convert to fraction form
    100,639.84/138,885.36 = 55,317.48/x
  3. Step 3: Cross multiply
    100,639.84x = 138,885.36 × 55,317.48
  4. Step 4: Simplify right side
    100,639.84x = 7,682,788,124.09
  5. Step 5: Solve for x
    x = 7,682,788,124.09/100,639.84
  6. Step 6: Final answer
    x = 76,339.43

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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.