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Finding the Fourth Proportional to 115.80, 172.93 and 109.05

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Solution

The fourth proportional to 115.80, 172.93 and 109.05 is: 162.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.80 : 172.93 = 109.05 : x
  2. Step 2: Convert to fraction form
    115.80/172.93 = 109.05/x
  3. Step 3: Cross multiply
    115.80x = 172.93 × 109.05
  4. Step 4: Simplify right side
    115.80x = 18,857.04
  5. Step 5: Solve for x
    x = 18,857.04/115.80
  6. Step 6: Final answer
    x = 162.84

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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.