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Finding the Fourth Proportional to 139.37, 192.21 and 90.25

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Solution

The fourth proportional to 139.37, 192.21 and 90.25 is: 124.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.37 : 192.21 = 90.25 : x
  2. Step 2: Convert to fraction form
    139.37/192.21 = 90.25/x
  3. Step 3: Cross multiply
    139.37x = 192.21 × 90.25
  4. Step 4: Simplify right side
    139.37x = 17,345.99
  5. Step 5: Solve for x
    x = 17,345.99/139.37
  6. Step 6: Final answer
    x = 124.46

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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.