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Finding the Fourth Proportional to 191.53, 287.11 and 143.65

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Solution

The fourth proportional to 191.53, 287.11 and 143.65 is: 215.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.53 : 287.11 = 143.65 : x
  2. Step 2: Convert to fraction form
    191.53/287.11 = 143.65/x
  3. Step 3: Cross multiply
    191.53x = 287.11 × 143.65
  4. Step 4: Simplify right side
    191.53x = 41,243.35
  5. Step 5: Solve for x
    x = 41,243.35/191.53
  6. Step 6: Final answer
    x = 215.34

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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.