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Finding the Fourth Proportional to 211.48, 315.49 and 193.32

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Solution

The fourth proportional to 211.48, 315.49 and 193.32 is: 288.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.48 : 315.49 = 193.32 : x
  2. Step 2: Convert to fraction form
    211.48/315.49 = 193.32/x
  3. Step 3: Cross multiply
    211.48x = 315.49 × 193.32
  4. Step 4: Simplify right side
    211.48x = 60,990.53
  5. Step 5: Solve for x
    x = 60,990.53/211.48
  6. Step 6: Final answer
    x = 288.40

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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.