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Finding the Fourth Proportional to 212.64, 317.08 and 195.81

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Solution

The fourth proportional to 212.64, 317.08 and 195.81 is: 291.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.64 : 317.08 = 195.81 : x
  2. Step 2: Convert to fraction form
    212.64/317.08 = 195.81/x
  3. Step 3: Cross multiply
    212.64x = 317.08 × 195.81
  4. Step 4: Simplify right side
    212.64x = 62,085.85
  5. Step 5: Solve for x
    x = 62,085.85/212.64
  6. Step 6: Final answer
    x = 291.98

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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.