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Finding the Fourth Proportional to 889.95, 1,224.41 and 865.65

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Solution

The fourth proportional to 889.95, 1,224.41 and 865.65 is: 1,190.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.95 : 1,224.41 = 865.65 : x
  2. Step 2: Convert to fraction form
    889.95/1,224.41 = 865.65/x
  3. Step 3: Cross multiply
    889.95x = 1,224.41 × 865.65
  4. Step 4: Simplify right side
    889.95x = 1,059,906.19
  5. Step 5: Solve for x
    x = 1,059,906.19/889.95
  6. Step 6: Final answer
    x = 1,190.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.