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Finding the Fourth Proportional to 139.53, 192.63 and 102.78

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Solution

The fourth proportional to 139.53, 192.63 and 102.78 is: 141.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.53 : 192.63 = 102.78 : x
  2. Step 2: Convert to fraction form
    139.53/192.63 = 102.78/x
  3. Step 3: Cross multiply
    139.53x = 192.63 × 102.78
  4. Step 4: Simplify right side
    139.53x = 19,798.51
  5. Step 5: Solve for x
    x = 19,798.51/139.53
  6. Step 6: Final answer
    x = 141.89

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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.