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Finding the Fourth Proportional to 68.33, 94.21 and 57.39

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Solution

The fourth proportional to 68.33, 94.21 and 57.39 is: 79.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.33 : 94.21 = 57.39 : x
  2. Step 2: Convert to fraction form
    68.33/94.21 = 57.39/x
  3. Step 3: Cross multiply
    68.33x = 94.21 × 57.39
  4. Step 4: Simplify right side
    68.33x = 5,406.71
  5. Step 5: Solve for x
    x = 5,406.71/68.33
  6. Step 6: Final answer
    x = 79.13

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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.