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Finding the Fourth Proportional to 212.61, 317.39 and 181.62

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Solution

The fourth proportional to 212.61, 317.39 and 181.62 is: 271.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.61 : 317.39 = 181.62 : x
  2. Step 2: Convert to fraction form
    212.61/317.39 = 181.62/x
  3. Step 3: Cross multiply
    212.61x = 317.39 × 181.62
  4. Step 4: Simplify right side
    212.61x = 57,643.46
  5. Step 5: Solve for x
    x = 57,643.46/212.61
  6. Step 6: Final answer
    x = 271.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.