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Finding the Fourth Proportional to 85.51, 128.49 and 51.33

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Solution

The fourth proportional to 85.51, 128.49 and 51.33 is: 77.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.51 : 128.49 = 51.33 : x
  2. Step 2: Convert to fraction form
    85.51/128.49 = 51.33/x
  3. Step 3: Cross multiply
    85.51x = 128.49 × 51.33
  4. Step 4: Simplify right side
    85.51x = 6,595.68
  5. Step 5: Solve for x
    x = 6,595.68/85.51
  6. Step 6: Final answer
    x = 77.14

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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.