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Finding the Fourth Proportional to 68.72, 94.74 and 45.39

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Solution

The fourth proportional to 68.72, 94.74 and 45.39 is: 62.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.72 : 94.74 = 45.39 : x
  2. Step 2: Convert to fraction form
    68.72/94.74 = 45.39/x
  3. Step 3: Cross multiply
    68.72x = 94.74 × 45.39
  4. Step 4: Simplify right side
    68.72x = 4,300.25
  5. Step 5: Solve for x
    x = 4,300.25/68.72
  6. Step 6: Final answer
    x = 62.58

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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.