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Finding the Fourth Proportional to 72.84, 100.42 and 65.56

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Solution

The fourth proportional to 72.84, 100.42 and 65.56 is: 90.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.84 : 100.42 = 65.56 : x
  2. Step 2: Convert to fraction form
    72.84/100.42 = 65.56/x
  3. Step 3: Cross multiply
    72.84x = 100.42 × 65.56
  4. Step 4: Simplify right side
    72.84x = 6,583.54
  5. Step 5: Solve for x
    x = 6,583.54/72.84
  6. Step 6: Final answer
    x = 90.38

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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.