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Finding the Fourth Proportional to 191.99, 264.87 and 155.21

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Solution

The fourth proportional to 191.99, 264.87 and 155.21 is: 214.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.99 : 264.87 = 155.21 : x
  2. Step 2: Convert to fraction form
    191.99/264.87 = 155.21/x
  3. Step 3: Cross multiply
    191.99x = 264.87 × 155.21
  4. Step 4: Simplify right side
    191.99x = 41,109.15
  5. Step 5: Solve for x
    x = 41,109.15/191.99
  6. Step 6: Final answer
    x = 214.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.