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Finding the Fourth Proportional to 860.82, 1,291.42 and 312.99

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Solution

The fourth proportional to 860.82, 1,291.42 and 312.99 is: 469.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.82 : 1,291.42 = 312.99 : x
  2. Step 2: Convert to fraction form
    860.82/1,291.42 = 312.99/x
  3. Step 3: Cross multiply
    860.82x = 1,291.42 × 312.99
  4. Step 4: Simplify right side
    860.82x = 404,201.55
  5. Step 5: Solve for x
    x = 404,201.55/860.82
  6. Step 6: Final answer
    x = 469.55

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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.