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Finding the Fourth Proportional to 139.66, 192.81 and 93.09

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Solution

The fourth proportional to 139.66, 192.81 and 93.09 is: 128.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.66 : 192.81 = 93.09 : x
  2. Step 2: Convert to fraction form
    139.66/192.81 = 93.09/x
  3. Step 3: Cross multiply
    139.66x = 192.81 × 93.09
  4. Step 4: Simplify right side
    139.66x = 17,948.22
  5. Step 5: Solve for x
    x = 17,948.22/139.66
  6. Step 6: Final answer
    x = 128.52

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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.