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Finding the Fourth Proportional to 236.48, 354.47 and 90.21

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Solution

The fourth proportional to 236.48, 354.47 and 90.21 is: 135.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.48 : 354.47 = 90.21 : x
  2. Step 2: Convert to fraction form
    236.48/354.47 = 90.21/x
  3. Step 3: Cross multiply
    236.48x = 354.47 × 90.21
  4. Step 4: Simplify right side
    236.48x = 31,976.29
  5. Step 5: Solve for x
    x = 31,976.29/236.48
  6. Step 6: Final answer
    x = 135.22

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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.