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Finding the Fourth Proportional to 119.98, 165.50 and 90.82

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Solution

The fourth proportional to 119.98, 165.50 and 90.82 is: 125.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.98 : 165.50 = 90.82 : x
  2. Step 2: Convert to fraction form
    119.98/165.50 = 90.82/x
  3. Step 3: Cross multiply
    119.98x = 165.50 × 90.82
  4. Step 4: Simplify right side
    119.98x = 15,030.71
  5. Step 5: Solve for x
    x = 15,030.71/119.98
  6. Step 6: Final answer
    x = 125.28

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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.