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Finding the Fourth Proportional to 68.50, 94.53 and 39.40

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Solution

The fourth proportional to 68.50, 94.53 and 39.40 is: 54.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.50 : 94.53 = 39.40 : x
  2. Step 2: Convert to fraction form
    68.50/94.53 = 39.40/x
  3. Step 3: Cross multiply
    68.50x = 94.53 × 39.40
  4. Step 4: Simplify right side
    68.50x = 3,724.48
  5. Step 5: Solve for x
    x = 3,724.48/68.50
  6. Step 6: Final answer
    x = 54.37

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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.