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Finding the Fourth Proportional to 107.26, 147.99 and 72.39

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Solution

The fourth proportional to 107.26, 147.99 and 72.39 is: 99.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.26 : 147.99 = 72.39 : x
  2. Step 2: Convert to fraction form
    107.26/147.99 = 72.39/x
  3. Step 3: Cross multiply
    107.26x = 147.99 × 72.39
  4. Step 4: Simplify right side
    107.26x = 10,713.82
  5. Step 5: Solve for x
    x = 10,713.82/107.26
  6. Step 6: Final answer
    x = 99.89

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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.