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Finding the Fourth Proportional to 212.37, 317.75 and 121.11

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Solution

The fourth proportional to 212.37, 317.75 and 121.11 is: 181.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.37 : 317.75 = 121.11 : x
  2. Step 2: Convert to fraction form
    212.37/317.75 = 121.11/x
  3. Step 3: Cross multiply
    212.37x = 317.75 × 121.11
  4. Step 4: Simplify right side
    212.37x = 38,482.10
  5. Step 5: Solve for x
    x = 38,482.10/212.37
  6. Step 6: Final answer
    x = 181.20

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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.