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Finding the Fourth Proportional to 119.19, 164.54 and 90.09

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Solution

The fourth proportional to 119.19, 164.54 and 90.09 is: 124.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.19 : 164.54 = 90.09 : x
  2. Step 2: Convert to fraction form
    119.19/164.54 = 90.09/x
  3. Step 3: Cross multiply
    119.19x = 164.54 × 90.09
  4. Step 4: Simplify right side
    119.19x = 14,823.41
  5. Step 5: Solve for x
    x = 14,823.41/119.19
  6. Step 6: Final answer
    x = 124.37

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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.