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Finding the Fourth Proportional to 286.26, 429.60 and 260.74

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Solution

The fourth proportional to 286.26, 429.60 and 260.74 is: 391.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.26 : 429.60 = 260.74 : x
  2. Step 2: Convert to fraction form
    286.26/429.60 = 260.74/x
  3. Step 3: Cross multiply
    286.26x = 429.60 × 260.74
  4. Step 4: Simplify right side
    286.26x = 112,015.42
  5. Step 5: Solve for x
    x = 112,015.42/286.26
  6. Step 6: Final answer
    x = 391.31

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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.