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Finding the Fourth Proportional to 105.51, 145.64 and 72.84

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Solution

The fourth proportional to 105.51, 145.64 and 72.84 is: 100.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.51 : 145.64 = 72.84 : x
  2. Step 2: Convert to fraction form
    105.51/145.64 = 72.84/x
  3. Step 3: Cross multiply
    105.51x = 145.64 × 72.84
  4. Step 4: Simplify right side
    105.51x = 10,608.42
  5. Step 5: Solve for x
    x = 10,608.42/105.51
  6. Step 6: Final answer
    x = 100.54

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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.