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Finding the Fourth Proportional to 191.80, 286.55 and 143.80

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Solution

The fourth proportional to 191.80, 286.55 and 143.80 is: 214.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.80 : 286.55 = 143.80 : x
  2. Step 2: Convert to fraction form
    191.80/286.55 = 143.80/x
  3. Step 3: Cross multiply
    191.80x = 286.55 × 143.80
  4. Step 4: Simplify right side
    191.80x = 41,205.89
  5. Step 5: Solve for x
    x = 41,205.89/191.80
  6. Step 6: Final answer
    x = 214.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.