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Finding the Fourth Proportional to 61.64, 84.88 and 61.44

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Solution

The fourth proportional to 61.64, 84.88 and 61.44 is: 84.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.64 : 84.88 = 61.44 : x
  2. Step 2: Convert to fraction form
    61.64/84.88 = 61.44/x
  3. Step 3: Cross multiply
    61.64x = 84.88 × 61.44
  4. Step 4: Simplify right side
    61.64x = 5,214.87
  5. Step 5: Solve for x
    x = 5,214.87/61.64
  6. Step 6: Final answer
    x = 84.61

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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.