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Finding the Fourth Proportional to 107.80, 160.85 and 90.82

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Solution

The fourth proportional to 107.80, 160.85 and 90.82 is: 135.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.80 : 160.85 = 90.82 : x
  2. Step 2: Convert to fraction form
    107.80/160.85 = 90.82/x
  3. Step 3: Cross multiply
    107.80x = 160.85 × 90.82
  4. Step 4: Simplify right side
    107.80x = 14,608.40
  5. Step 5: Solve for x
    x = 14,608.40/107.80
  6. Step 6: Final answer
    x = 135.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.