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Finding the Fourth Proportional to 64.67, 89.16 and 61.43

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Solution

The fourth proportional to 64.67, 89.16 and 61.43 is: 84.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.67 : 89.16 = 61.43 : x
  2. Step 2: Convert to fraction form
    64.67/89.16 = 61.43/x
  3. Step 3: Cross multiply
    64.67x = 89.16 × 61.43
  4. Step 4: Simplify right side
    64.67x = 5,476.65
  5. Step 5: Solve for x
    x = 5,476.65/64.67
  6. Step 6: Final answer
    x = 84.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.