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Finding the Fourth Proportional to 72.97, 109.40 and 40.48

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Solution

The fourth proportional to 72.97, 109.40 and 40.48 is: 60.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.97 : 109.40 = 40.48 : x
  2. Step 2: Convert to fraction form
    72.97/109.40 = 40.48/x
  3. Step 3: Cross multiply
    72.97x = 109.40 × 40.48
  4. Step 4: Simplify right side
    72.97x = 4,428.51
  5. Step 5: Solve for x
    x = 4,428.51/72.97
  6. Step 6: Final answer
    x = 60.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.