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Finding the Fourth Proportional to 268.74, 370.87 and 158.21

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Solution

The fourth proportional to 268.74, 370.87 and 158.21 is: 218.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.74 : 370.87 = 158.21 : x
  2. Step 2: Convert to fraction form
    268.74/370.87 = 158.21/x
  3. Step 3: Cross multiply
    268.74x = 370.87 × 158.21
  4. Step 4: Simplify right side
    268.74x = 58,675.34
  5. Step 5: Solve for x
    x = 58,675.34/268.74
  6. Step 6: Final answer
    x = 218.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.