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Finding the Fourth Proportional to 104.86, 145.33 and 103.30

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Solution

The fourth proportional to 104.86, 145.33 and 103.30 is: 143.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.86 : 145.33 = 103.30 : x
  2. Step 2: Convert to fraction form
    104.86/145.33 = 103.30/x
  3. Step 3: Cross multiply
    104.86x = 145.33 × 103.30
  4. Step 4: Simplify right side
    104.86x = 15,012.59
  5. Step 5: Solve for x
    x = 15,012.59/104.86
  6. Step 6: Final answer
    x = 143.17

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.