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Finding the Fourth Proportional to 85.93, 128.64 and 57.37

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Solution

The fourth proportional to 85.93, 128.64 and 57.37 is: 85.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.93 : 128.64 = 57.37 : x
  2. Step 2: Convert to fraction form
    85.93/128.64 = 57.37/x
  3. Step 3: Cross multiply
    85.93x = 128.64 × 57.37
  4. Step 4: Simplify right side
    85.93x = 7,380.08
  5. Step 5: Solve for x
    x = 7,380.08/85.93
  6. Step 6: Final answer
    x = 85.88

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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.