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Finding the Fourth Proportional to 72.60, 108.24 and 69.84

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Solution

The fourth proportional to 72.60, 108.24 and 69.84 is: 104.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.60 : 108.24 = 69.84 : x
  2. Step 2: Convert to fraction form
    72.60/108.24 = 69.84/x
  3. Step 3: Cross multiply
    72.60x = 108.24 × 69.84
  4. Step 4: Simplify right side
    72.60x = 7,559.48
  5. Step 5: Solve for x
    x = 7,559.48/72.60
  6. Step 6: Final answer
    x = 104.13

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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.