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Finding the Fourth Proportional to 103.91, 155.55 and 83.45

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Solution

The fourth proportional to 103.91, 155.55 and 83.45 is: 124.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.91 : 155.55 = 83.45 : x
  2. Step 2: Convert to fraction form
    103.91/155.55 = 83.45/x
  3. Step 3: Cross multiply
    103.91x = 155.55 × 83.45
  4. Step 4: Simplify right side
    103.91x = 12,980.65
  5. Step 5: Solve for x
    x = 12,980.65/103.91
  6. Step 6: Final answer
    x = 124.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.