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Finding the Fourth Proportional to 78.23, 107.92 and 65.93

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Solution

The fourth proportional to 78.23, 107.92 and 65.93 is: 90.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.23 : 107.92 = 65.93 : x
  2. Step 2: Convert to fraction form
    78.23/107.92 = 65.93/x
  3. Step 3: Cross multiply
    78.23x = 107.92 × 65.93
  4. Step 4: Simplify right side
    78.23x = 7,114.94
  5. Step 5: Solve for x
    x = 7,114.94/78.23
  6. Step 6: Final answer
    x = 90.95

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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.