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Finding the Fourth Proportional to 89.70, 134.55 and 68.30

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Solution

The fourth proportional to 89.70, 134.55 and 68.30 is: 102.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.70 : 134.55 = 68.30 : x
  2. Step 2: Convert to fraction form
    89.70/134.55 = 68.30/x
  3. Step 3: Cross multiply
    89.70x = 134.55 × 68.30
  4. Step 4: Simplify right side
    89.70x = 9,190.10
  5. Step 5: Solve for x
    x = 9,190.10/89.70
  6. Step 6: Final answer
    x = 102.45

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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.