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Finding the Fourth Proportional to 211.60, 317.44 and 74.65

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Solution

The fourth proportional to 211.60, 317.44 and 74.65 is: 111.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.60 : 317.44 = 74.65 : x
  2. Step 2: Convert to fraction form
    211.60/317.44 = 74.65/x
  3. Step 3: Cross multiply
    211.60x = 317.44 × 74.65
  4. Step 4: Simplify right side
    211.60x = 23,696.90
  5. Step 5: Solve for x
    x = 23,696.90/211.60
  6. Step 6: Final answer
    x = 111.99

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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.