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Finding the Fourth Proportional to 85.39, 127.84 and 64.03

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Solution

The fourth proportional to 85.39, 127.84 and 64.03 is: 95.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.39 : 127.84 = 64.03 : x
  2. Step 2: Convert to fraction form
    85.39/127.84 = 64.03/x
  3. Step 3: Cross multiply
    85.39x = 127.84 × 64.03
  4. Step 4: Simplify right side
    85.39x = 8,184.64
  5. Step 5: Solve for x
    x = 8,184.64/85.39
  6. Step 6: Final answer
    x = 95.86

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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.