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Finding the Fourth Proportional to 72.84, 108.74 and 70.31

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Solution

The fourth proportional to 72.84, 108.74 and 70.31 is: 104.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.84 : 108.74 = 70.31 : x
  2. Step 2: Convert to fraction form
    72.84/108.74 = 70.31/x
  3. Step 3: Cross multiply
    72.84x = 108.74 × 70.31
  4. Step 4: Simplify right side
    72.84x = 7,645.51
  5. Step 5: Solve for x
    x = 7,645.51/72.84
  6. Step 6: Final answer
    x = 104.96

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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.