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Finding the Fourth Proportional to 172.83, 259.57 and 121.90

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Solution

The fourth proportional to 172.83, 259.57 and 121.90 is: 183.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.83 : 259.57 = 121.90 : x
  2. Step 2: Convert to fraction form
    172.83/259.57 = 121.90/x
  3. Step 3: Cross multiply
    172.83x = 259.57 × 121.90
  4. Step 4: Simplify right side
    172.83x = 31,641.58
  5. Step 5: Solve for x
    x = 31,641.58/172.83
  6. Step 6: Final answer
    x = 183.08

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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.