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Finding the Fourth Proportional to 191.77, 287.38 and 143.71

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Solution

The fourth proportional to 191.77, 287.38 and 143.71 is: 215.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.77 : 287.38 = 143.71 : x
  2. Step 2: Convert to fraction form
    191.77/287.38 = 143.71/x
  3. Step 3: Cross multiply
    191.77x = 287.38 × 143.71
  4. Step 4: Simplify right side
    191.77x = 41,298.84
  5. Step 5: Solve for x
    x = 41,298.84/191.77
  6. Step 6: Final answer
    x = 215.36

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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.