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Finding the Fourth Proportional to 72.51, 108.80 and 43.62

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Solution

The fourth proportional to 72.51, 108.80 and 43.62 is: 65.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.51 : 108.80 = 43.62 : x
  2. Step 2: Convert to fraction form
    72.51/108.80 = 43.62/x
  3. Step 3: Cross multiply
    72.51x = 108.80 × 43.62
  4. Step 4: Simplify right side
    72.51x = 4,745.64
  5. Step 5: Solve for x
    x = 4,745.64/72.51
  6. Step 6: Final answer
    x = 65.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.