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Finding the Fourth Proportional to 72.93, 108.78 and 68.37

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Solution

The fourth proportional to 72.93, 108.78 and 68.37 is: 101.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.93 : 108.78 = 68.37 : x
  2. Step 2: Convert to fraction form
    72.93/108.78 = 68.37/x
  3. Step 3: Cross multiply
    72.93x = 108.78 × 68.37
  4. Step 4: Simplify right side
    72.93x = 7,437.29
  5. Step 5: Solve for x
    x = 7,437.29/72.93
  6. Step 6: Final answer
    x = 101.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.