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Finding the Fourth Proportional to 286.60, 429.75 and 103.90

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Solution

The fourth proportional to 286.60, 429.75 and 103.90 is: 155.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.60 : 429.75 = 103.90 : x
  2. Step 2: Convert to fraction form
    286.60/429.75 = 103.90/x
  3. Step 3: Cross multiply
    286.60x = 429.75 × 103.90
  4. Step 4: Simplify right side
    286.60x = 44,651.03
  5. Step 5: Solve for x
    x = 44,651.03/286.60
  6. Step 6: Final answer
    x = 155.80

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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.