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Finding the Fourth Proportional to 68.18, 102.17 and 45

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Solution

The fourth proportional to 68.18, 102.17 and 45 is: 67.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.18 : 102.17 = 45 : x
  2. Step 2: Convert to fraction form
    68.18/102.17 = 45/x
  3. Step 3: Cross multiply
    68.18x = 102.17 × 45
  4. Step 4: Simplify right side
    68.18x = 4,597.76
  5. Step 5: Solve for x
    x = 4,597.76/68.18
  6. Step 6: Final answer
    x = 67.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.