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Finding the Fourth Proportional to 64.77, 97.15 and 19.12

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Solution

The fourth proportional to 64.77, 97.15 and 19.12 is: 28.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.77 : 97.15 = 19.12 : x
  2. Step 2: Convert to fraction form
    64.77/97.15 = 19.12/x
  3. Step 3: Cross multiply
    64.77x = 97.15 × 19.12
  4. Step 4: Simplify right side
    64.77x = 1,857.08
  5. Step 5: Solve for x
    x = 1,857.08/64.77
  6. Step 6: Final answer
    x = 28.67

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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.