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Finding the Fourth Proportional to 842.82, 1,263.91 and 386.50

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Solution

The fourth proportional to 842.82, 1,263.91 and 386.50 is: 579.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.82 : 1,263.91 = 386.50 : x
  2. Step 2: Convert to fraction form
    842.82/1,263.91 = 386.50/x
  3. Step 3: Cross multiply
    842.82x = 1,263.91 × 386.50
  4. Step 4: Simplify right side
    842.82x = 488,501.22
  5. Step 5: Solve for x
    x = 488,501.22/842.82
  6. Step 6: Final answer
    x = 579.60

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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.