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Finding the Fourth Proportional to 191.66, 287.49 and 83.45

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Solution

The fourth proportional to 191.66, 287.49 and 83.45 is: 125.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.66 : 287.49 = 83.45 : x
  2. Step 2: Convert to fraction form
    191.66/287.49 = 83.45/x
  3. Step 3: Cross multiply
    191.66x = 287.49 × 83.45
  4. Step 4: Simplify right side
    191.66x = 23,989.60
  5. Step 5: Solve for x
    x = 23,989.60/191.66
  6. Step 6: Final answer
    x = 125.17

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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.