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Finding the Fourth Proportional to 78.23, 107.96 and 45.47

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Solution

The fourth proportional to 78.23, 107.96 and 45.47 is: 62.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.23 : 107.96 = 45.47 : x
  2. Step 2: Convert to fraction form
    78.23/107.96 = 45.47/x
  3. Step 3: Cross multiply
    78.23x = 107.96 × 45.47
  4. Step 4: Simplify right side
    78.23x = 4,908.98
  5. Step 5: Solve for x
    x = 4,908.98/78.23
  6. Step 6: Final answer
    x = 62.75

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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.