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Finding the Fourth Proportional to 212.41, 318.54 and 90.64

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Solution

The fourth proportional to 212.41, 318.54 and 90.64 is: 135.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.41 : 318.54 = 90.64 : x
  2. Step 2: Convert to fraction form
    212.41/318.54 = 90.64/x
  3. Step 3: Cross multiply
    212.41x = 318.54 × 90.64
  4. Step 4: Simplify right side
    212.41x = 28,872.47
  5. Step 5: Solve for x
    x = 28,872.47/212.41
  6. Step 6: Final answer
    x = 135.93

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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.