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Finding the Fourth Proportional to 212.42, 318.74 and 187.11

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Solution

The fourth proportional to 212.42, 318.74 and 187.11 is: 280.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.42 : 318.74 = 187.11 : x
  2. Step 2: Convert to fraction form
    212.42/318.74 = 187.11/x
  3. Step 3: Cross multiply
    212.42x = 318.74 × 187.11
  4. Step 4: Simplify right side
    212.42x = 59,638.51
  5. Step 5: Solve for x
    x = 59,638.51/212.42
  6. Step 6: Final answer
    x = 280.75

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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.