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Finding the Fourth Proportional to 139.67, 192.78 and 93.13

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Solution

The fourth proportional to 139.67, 192.78 and 93.13 is: 128.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.67 : 192.78 = 93.13 : x
  2. Step 2: Convert to fraction form
    139.67/192.78 = 93.13/x
  3. Step 3: Cross multiply
    139.67x = 192.78 × 93.13
  4. Step 4: Simplify right side
    139.67x = 17,953.60
  5. Step 5: Solve for x
    x = 17,953.60/139.67
  6. Step 6: Final answer
    x = 128.54

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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.