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Finding the Fourth Proportional to 77.79, 107.38 and 53.35

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Solution

The fourth proportional to 77.79, 107.38 and 53.35 is: 73.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.79 : 107.38 = 53.35 : x
  2. Step 2: Convert to fraction form
    77.79/107.38 = 53.35/x
  3. Step 3: Cross multiply
    77.79x = 107.38 × 53.35
  4. Step 4: Simplify right side
    77.79x = 5,728.72
  5. Step 5: Solve for x
    x = 5,728.72/77.79
  6. Step 6: Final answer
    x = 73.64

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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.