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Finding the Fourth Proportional to 69.15, 103.74 and 64.71

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Solution

The fourth proportional to 69.15, 103.74 and 64.71 is: 97.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.15 : 103.74 = 64.71 : x
  2. Step 2: Convert to fraction form
    69.15/103.74 = 64.71/x
  3. Step 3: Cross multiply
    69.15x = 103.74 × 64.71
  4. Step 4: Simplify right side
    69.15x = 6,713.02
  5. Step 5: Solve for x
    x = 6,713.02/69.15
  6. Step 6: Final answer
    x = 97.08

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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.