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Finding the Fourth Proportional to 236.65, 354.80 and 90.39

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Solution

The fourth proportional to 236.65, 354.80 and 90.39 is: 135.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.65 : 354.80 = 90.39 : x
  2. Step 2: Convert to fraction form
    236.65/354.80 = 90.39/x
  3. Step 3: Cross multiply
    236.65x = 354.80 × 90.39
  4. Step 4: Simplify right side
    236.65x = 32,070.37
  5. Step 5: Solve for x
    x = 32,070.37/236.65
  6. Step 6: Final answer
    x = 135.52

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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.