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Finding the Fourth Proportional to 212.84, 318.99 and 115.39

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Solution

The fourth proportional to 212.84, 318.99 and 115.39 is: 172.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.84 : 318.99 = 115.39 : x
  2. Step 2: Convert to fraction form
    212.84/318.99 = 115.39/x
  3. Step 3: Cross multiply
    212.84x = 318.99 × 115.39
  4. Step 4: Simplify right side
    212.84x = 36,807.89
  5. Step 5: Solve for x
    x = 36,807.89/212.84
  6. Step 6: Final answer
    x = 172.93

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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.