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Finding the Fourth Proportional to 104.43, 155.47 and 103.21

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Solution

The fourth proportional to 104.43, 155.47 and 103.21 is: 153.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.43 : 155.47 = 103.21 : x
  2. Step 2: Convert to fraction form
    104.43/155.47 = 103.21/x
  3. Step 3: Cross multiply
    104.43x = 155.47 × 103.21
  4. Step 4: Simplify right side
    104.43x = 16,045.54
  5. Step 5: Solve for x
    x = 16,045.54/104.43
  6. Step 6: Final answer
    x = 153.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.