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Finding the Fourth Proportional to 85.38, 127.94 and 56.45

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Solution

The fourth proportional to 85.38, 127.94 and 56.45 is: 84.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.38 : 127.94 = 56.45 : x
  2. Step 2: Convert to fraction form
    85.38/127.94 = 56.45/x
  3. Step 3: Cross multiply
    85.38x = 127.94 × 56.45
  4. Step 4: Simplify right side
    85.38x = 7,221.29
  5. Step 5: Solve for x
    x = 7,221.29/85.38
  6. Step 6: Final answer
    x = 84.58

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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.