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Finding the Fourth Proportional to 107.79, 161.45 and 78.95

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Solution

The fourth proportional to 107.79, 161.45 and 78.95 is: 118.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.79 : 161.45 = 78.95 : x
  2. Step 2: Convert to fraction form
    107.79/161.45 = 78.95/x
  3. Step 3: Cross multiply
    107.79x = 161.45 × 78.95
  4. Step 4: Simplify right side
    107.79x = 12,746.55
  5. Step 5: Solve for x
    x = 12,746.55/107.79
  6. Step 6: Final answer
    x = 118.25

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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.