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Finding the Fourth Proportional to 286.21, 429.09 and 103.51

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Solution

The fourth proportional to 286.21, 429.09 and 103.51 is: 155.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.21 : 429.09 = 103.51 : x
  2. Step 2: Convert to fraction form
    286.21/429.09 = 103.51/x
  3. Step 3: Cross multiply
    286.21x = 429.09 × 103.51
  4. Step 4: Simplify right side
    286.21x = 44,415.11
  5. Step 5: Solve for x
    x = 44,415.11/286.21
  6. Step 6: Final answer
    x = 155.18

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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.