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Finding the Fourth Proportional to 72.80, 107.20 and 72.80

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Solution

The fourth proportional to 72.80, 107.20 and 72.80 is: 107.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.80 : 107.20 = 72.80 : x
  2. Step 2: Convert to fraction form
    72.80/107.20 = 72.80/x
  3. Step 3: Cross multiply
    72.80x = 107.20 × 72.80
  4. Step 4: Simplify right side
    72.80x = 7,804.16
  5. Step 5: Solve for x
    x = 7,804.16/72.80
  6. Step 6: Final answer
    x = 107.20

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.