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Finding the Fourth Proportional to 212.64, 318.94 and 75.68

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Solution

The fourth proportional to 212.64, 318.94 and 75.68 is: 113.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.64 : 318.94 = 75.68 : x
  2. Step 2: Convert to fraction form
    212.64/318.94 = 75.68/x
  3. Step 3: Cross multiply
    212.64x = 318.94 × 75.68
  4. Step 4: Simplify right side
    212.64x = 24,138.11
  5. Step 5: Solve for x
    x = 24,138.11/212.64
  6. Step 6: Final answer
    x = 113.52

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.