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Finding the Fourth Proportional to 68,671.81, 94,785.42 and 64,489.78

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Solution

The fourth proportional to 68,671.81, 94,785.42 and 64,489.78 is: 89,013.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,671.81 : 94,785.42 = 64,489.78 : x
  2. Step 2: Convert to fraction form
    68,671.81/94,785.42 = 64,489.78/x
  3. Step 3: Cross multiply
    68,671.81x = 94,785.42 × 64,489.78
  4. Step 4: Simplify right side
    68,671.81x = 6,112,690,883.01
  5. Step 5: Solve for x
    x = 6,112,690,883.01/68,671.81
  6. Step 6: Final answer
    x = 89,013.10

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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.