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Finding the Fourth Proportional to 212.10, 317.75 and 171.47

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Solution

The fourth proportional to 212.10, 317.75 and 171.47 is: 256.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.10 : 317.75 = 171.47 : x
  2. Step 2: Convert to fraction form
    212.10/317.75 = 171.47/x
  3. Step 3: Cross multiply
    212.10x = 317.75 × 171.47
  4. Step 4: Simplify right side
    212.10x = 54,482.15
  5. Step 5: Solve for x
    x = 54,482.15/212.10
  6. Step 6: Final answer
    x = 256.87

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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.