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Finding the Fourth Proportional to 213.30, 317.93 and 191.70

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Solution

The fourth proportional to 213.30, 317.93 and 191.70 is: 285.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.30 : 317.93 = 191.70 : x
  2. Step 2: Convert to fraction form
    213.30/317.93 = 191.70/x
  3. Step 3: Cross multiply
    213.30x = 317.93 × 191.70
  4. Step 4: Simplify right side
    213.30x = 60,946.22
  5. Step 5: Solve for x
    x = 60,946.22/213.30
  6. Step 6: Final answer
    x = 285.73

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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.