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Finding the Fourth Proportional to 70.55, 105.89 and 64.65

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Solution

The fourth proportional to 70.55, 105.89 and 64.65 is: 97.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.55 : 105.89 = 64.65 : x
  2. Step 2: Convert to fraction form
    70.55/105.89 = 64.65/x
  3. Step 3: Cross multiply
    70.55x = 105.89 × 64.65
  4. Step 4: Simplify right side
    70.55x = 6,845.47
  5. Step 5: Solve for x
    x = 6,845.47/70.55
  6. Step 6: Final answer
    x = 97.04

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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.