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Finding the Fourth Proportional to 64.87, 97.46 and 42.09

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Solution

The fourth proportional to 64.87, 97.46 and 42.09 is: 63.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.87 : 97.46 = 42.09 : x
  2. Step 2: Convert to fraction form
    64.87/97.46 = 42.09/x
  3. Step 3: Cross multiply
    64.87x = 97.46 × 42.09
  4. Step 4: Simplify right side
    64.87x = 4,102.09
  5. Step 5: Solve for x
    x = 4,102.09/64.87
  6. Step 6: Final answer
    x = 63.24

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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.