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Finding the Fourth Proportional to 68,955.72, 103,380.93 and 31,489.79

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Solution

The fourth proportional to 68,955.72, 103,380.93 and 31,489.79 is: 47,210.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,955.72 : 103,380.93 = 31,489.79 : x
  2. Step 2: Convert to fraction form
    68,955.72/103,380.93 = 31,489.79/x
  3. Step 3: Cross multiply
    68,955.72x = 103,380.93 × 31,489.79
  4. Step 4: Simplify right side
    68,955.72x = 3,255,443,258.80
  5. Step 5: Solve for x
    x = 3,255,443,258.80/68,955.72
  6. Step 6: Final answer
    x = 47,210.63

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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.