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Finding the Fourth Proportional to 286.90, 430.38 and 190.50

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Solution

The fourth proportional to 286.90, 430.38 and 190.50 is: 285.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.90 : 430.38 = 190.50 : x
  2. Step 2: Convert to fraction form
    286.90/430.38 = 190.50/x
  3. Step 3: Cross multiply
    286.90x = 430.38 × 190.50
  4. Step 4: Simplify right side
    286.90x = 81,987.39
  5. Step 5: Solve for x
    x = 81,987.39/286.90
  6. Step 6: Final answer
    x = 285.77

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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.