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Finding the Fourth Proportional to 191.58, 287 and 133.68

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Solution

The fourth proportional to 191.58, 287 and 133.68 is: 200.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.58 : 287 = 133.68 : x
  2. Step 2: Convert to fraction form
    191.58/287 = 133.68/x
  3. Step 3: Cross multiply
    191.58x = 287 × 133.68
  4. Step 4: Simplify right side
    191.58x = 38,366.16
  5. Step 5: Solve for x
    x = 38,366.16/191.58
  6. Step 6: Final answer
    x = 200.26

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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.