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Finding the Fourth Proportional to 104.63, 143.31 and 103.31

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Solution

The fourth proportional to 104.63, 143.31 and 103.31 is: 141.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.63 : 143.31 = 103.31 : x
  2. Step 2: Convert to fraction form
    104.63/143.31 = 103.31/x
  3. Step 3: Cross multiply
    104.63x = 143.31 × 103.31
  4. Step 4: Simplify right side
    104.63x = 14,804.64
  5. Step 5: Solve for x
    x = 14,804.64/104.63
  6. Step 6: Final answer
    x = 141.50

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.