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Finding the Fourth Proportional to 911.99, 1,359.31 and 860.09

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Solution

The fourth proportional to 911.99, 1,359.31 and 860.09 is: 1,281.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.99 : 1,359.31 = 860.09 : x
  2. Step 2: Convert to fraction form
    911.99/1,359.31 = 860.09/x
  3. Step 3: Cross multiply
    911.99x = 1,359.31 × 860.09
  4. Step 4: Simplify right side
    911.99x = 1,169,134.49
  5. Step 5: Solve for x
    x = 1,169,134.49/911.99
  6. Step 6: Final answer
    x = 1,281.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.