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Finding the Fourth Proportional to 77.78, 107.36 and 45.04

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Solution

The fourth proportional to 77.78, 107.36 and 45.04 is: 62.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.78 : 107.36 = 45.04 : x
  2. Step 2: Convert to fraction form
    77.78/107.36 = 45.04/x
  3. Step 3: Cross multiply
    77.78x = 107.36 × 45.04
  4. Step 4: Simplify right side
    77.78x = 4,835.49
  5. Step 5: Solve for x
    x = 4,835.49/77.78
  6. Step 6: Final answer
    x = 62.17

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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.