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Finding the Fourth Proportional to 98.39, 135.81 and 65.64

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Solution

The fourth proportional to 98.39, 135.81 and 65.64 is: 90.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.39 : 135.81 = 65.64 : x
  2. Step 2: Convert to fraction form
    98.39/135.81 = 65.64/x
  3. Step 3: Cross multiply
    98.39x = 135.81 × 65.64
  4. Step 4: Simplify right side
    98.39x = 8,915.08
  5. Step 5: Solve for x
    x = 8,915.08/98.39
  6. Step 6: Final answer
    x = 90.61

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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.