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Finding the Fourth Proportional to 66.67, 100.59 and 64.58

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Solution

The fourth proportional to 66.67, 100.59 and 64.58 is: 97.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.67 : 100.59 = 64.58 : x
  2. Step 2: Convert to fraction form
    66.67/100.59 = 64.58/x
  3. Step 3: Cross multiply
    66.67x = 100.59 × 64.58
  4. Step 4: Simplify right side
    66.67x = 6,496.10
  5. Step 5: Solve for x
    x = 6,496.10/66.67
  6. Step 6: Final answer
    x = 97.44

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.