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Finding the Fourth Proportional to 190.57, 285.42 and 87.70

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Solution

The fourth proportional to 190.57, 285.42 and 87.70 is: 131.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.57 : 285.42 = 87.70 : x
  2. Step 2: Convert to fraction form
    190.57/285.42 = 87.70/x
  3. Step 3: Cross multiply
    190.57x = 285.42 × 87.70
  4. Step 4: Simplify right side
    190.57x = 25,031.48
  5. Step 5: Solve for x
    x = 25,031.48/190.57
  6. Step 6: Final answer
    x = 131.35

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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.