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Finding the Fourth Proportional to 917.22, 1,378.84 and 849.56

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Solution

The fourth proportional to 917.22, 1,378.84 and 849.56 is: 1,277.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.22 : 1,378.84 = 849.56 : x
  2. Step 2: Convert to fraction form
    917.22/1,378.84 = 849.56/x
  3. Step 3: Cross multiply
    917.22x = 1,378.84 × 849.56
  4. Step 4: Simplify right side
    917.22x = 1,171,407.31
  5. Step 5: Solve for x
    x = 1,171,407.31/917.22
  6. Step 6: Final answer
    x = 1,277.13

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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.