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Finding the Fourth Proportional to 115.77, 173.70 and 85.38

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Solution

The fourth proportional to 115.77, 173.70 and 85.38 is: 128.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.77 : 173.70 = 85.38 : x
  2. Step 2: Convert to fraction form
    115.77/173.70 = 85.38/x
  3. Step 3: Cross multiply
    115.77x = 173.70 × 85.38
  4. Step 4: Simplify right side
    115.77x = 14,830.51
  5. Step 5: Solve for x
    x = 14,830.51/115.77
  6. Step 6: Final answer
    x = 128.10

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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.