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Finding the Fourth Proportional to 64.94, 97.34 and 42.12

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Solution

The fourth proportional to 64.94, 97.34 and 42.12 is: 63.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.94 : 97.34 = 42.12 : x
  2. Step 2: Convert to fraction form
    64.94/97.34 = 42.12/x
  3. Step 3: Cross multiply
    64.94x = 97.34 × 42.12
  4. Step 4: Simplify right side
    64.94x = 4,099.96
  5. Step 5: Solve for x
    x = 4,099.96/64.94
  6. Step 6: Final answer
    x = 63.13

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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.