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Finding the Fourth Proportional to 68.74, 94.85 and 42.50

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Solution

The fourth proportional to 68.74, 94.85 and 42.50 is: 58.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.74 : 94.85 = 42.50 : x
  2. Step 2: Convert to fraction form
    68.74/94.85 = 42.50/x
  3. Step 3: Cross multiply
    68.74x = 94.85 × 42.50
  4. Step 4: Simplify right side
    68.74x = 4,031.13
  5. Step 5: Solve for x
    x = 4,031.13/68.74
  6. Step 6: Final answer
    x = 58.64

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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.