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Finding the Fourth Proportional to 64.72, 97.12 and 39.10

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Solution

The fourth proportional to 64.72, 97.12 and 39.10 is: 58.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.72 : 97.12 = 39.10 : x
  2. Step 2: Convert to fraction form
    64.72/97.12 = 39.10/x
  3. Step 3: Cross multiply
    64.72x = 97.12 × 39.10
  4. Step 4: Simplify right side
    64.72x = 3,797.39
  5. Step 5: Solve for x
    x = 3,797.39/64.72
  6. Step 6: Final answer
    x = 58.67

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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.