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Finding the Fourth Proportional to 68.20, 94.04 and 57.28

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Solution

The fourth proportional to 68.20, 94.04 and 57.28 is: 78.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.20 : 94.04 = 57.28 : x
  2. Step 2: Convert to fraction form
    68.20/94.04 = 57.28/x
  3. Step 3: Cross multiply
    68.20x = 94.04 × 57.28
  4. Step 4: Simplify right side
    68.20x = 5,386.61
  5. Step 5: Solve for x
    x = 5,386.61/68.20
  6. Step 6: Final answer
    x = 78.98

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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.