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Finding the Fourth Proportional to 115.16, 171.86 and 103.64

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Solution

The fourth proportional to 115.16, 171.86 and 103.64 is: 154.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.16 : 171.86 = 103.64 : x
  2. Step 2: Convert to fraction form
    115.16/171.86 = 103.64/x
  3. Step 3: Cross multiply
    115.16x = 171.86 × 103.64
  4. Step 4: Simplify right side
    115.16x = 17,810.19
  5. Step 5: Solve for x
    x = 17,810.19/115.16
  6. Step 6: Final answer
    x = 154.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.