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Finding the Fourth Proportional to 286.31, 429.52 and 91.36

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Solution

The fourth proportional to 286.31, 429.52 and 91.36 is: 137.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.31 : 429.52 = 91.36 : x
  2. Step 2: Convert to fraction form
    286.31/429.52 = 91.36/x
  3. Step 3: Cross multiply
    286.31x = 429.52 × 91.36
  4. Step 4: Simplify right side
    286.31x = 39,238.69
  5. Step 5: Solve for x
    x = 39,238.69/286.31
  6. Step 6: Final answer
    x = 137.05

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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.