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Finding the Fourth Proportional to 73.08, 100.32 and 65.79

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Solution

The fourth proportional to 73.08, 100.32 and 65.79 is: 90.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.08 : 100.32 = 65.79 : x
  2. Step 2: Convert to fraction form
    73.08/100.32 = 65.79/x
  3. Step 3: Cross multiply
    73.08x = 100.32 × 65.79
  4. Step 4: Simplify right side
    73.08x = 6,600.05
  5. Step 5: Solve for x
    x = 6,600.05/73.08
  6. Step 6: Final answer
    x = 90.31

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.