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Finding the Fourth Proportional to 72.54, 109.29 and 70.11

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Solution

The fourth proportional to 72.54, 109.29 and 70.11 is: 105.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.54 : 109.29 = 70.11 : x
  2. Step 2: Convert to fraction form
    72.54/109.29 = 70.11/x
  3. Step 3: Cross multiply
    72.54x = 109.29 × 70.11
  4. Step 4: Simplify right side
    72.54x = 7,662.58
  5. Step 5: Solve for x
    x = 7,662.58/72.54
  6. Step 6: Final answer
    x = 105.63

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.