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Finding the Fourth Proportional to 190.50, 285.72 and 87.78

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Solution

The fourth proportional to 190.50, 285.72 and 87.78 is: 131.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.50 : 285.72 = 87.78 : x
  2. Step 2: Convert to fraction form
    190.50/285.72 = 87.78/x
  3. Step 3: Cross multiply
    190.50x = 285.72 × 87.78
  4. Step 4: Simplify right side
    190.50x = 25,080.50
  5. Step 5: Solve for x
    x = 25,080.50/190.50
  6. Step 6: Final answer
    x = 131.66

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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.