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Finding the Fourth Proportional to 286.40, 429.29 and 139.95

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Solution

The fourth proportional to 286.40, 429.29 and 139.95 is: 209.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.40 : 429.29 = 139.95 : x
  2. Step 2: Convert to fraction form
    286.40/429.29 = 139.95/x
  3. Step 3: Cross multiply
    286.40x = 429.29 × 139.95
  4. Step 4: Simplify right side
    286.40x = 60,078.44
  5. Step 5: Solve for x
    x = 60,078.44/286.40
  6. Step 6: Final answer
    x = 209.77

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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.