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Finding the Fourth Proportional to 66.91, 100.61 and 64.48

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Solution

The fourth proportional to 66.91, 100.61 and 64.48 is: 96.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.91 : 100.61 = 64.48 : x
  2. Step 2: Convert to fraction form
    66.91/100.61 = 64.48/x
  3. Step 3: Cross multiply
    66.91x = 100.61 × 64.48
  4. Step 4: Simplify right side
    66.91x = 6,486.51
  5. Step 5: Solve for x
    x = 6,486.51/66.91
  6. Step 6: Final answer
    x = 96.95

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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.