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Finding the Fourth Proportional to 581, 871.31 and 190.90

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Solution

The fourth proportional to 581, 871.31 and 190.90 is: 286.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    581 : 871.31 = 190.90 : x
  2. Step 2: Convert to fraction form
    581/871.31 = 190.90/x
  3. Step 3: Cross multiply
    581x = 871.31 × 190.90
  4. Step 4: Simplify right side
    581x = 166,328.72
  5. Step 5: Solve for x
    x = 166,328.72/581
  6. Step 6: Final answer
    x = 286.28

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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.