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Finding the Fourth Proportional to 107.97, 162.59 and 77.75

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Solution

The fourth proportional to 107.97, 162.59 and 77.75 is: 117.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.97 : 162.59 = 77.75 : x
  2. Step 2: Convert to fraction form
    107.97/162.59 = 77.75/x
  3. Step 3: Cross multiply
    107.97x = 162.59 × 77.75
  4. Step 4: Simplify right side
    107.97x = 12,641.37
  5. Step 5: Solve for x
    x = 12,641.37/107.97
  6. Step 6: Final answer
    x = 117.08

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.