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Finding the Fourth Proportional to 918.56, 1,267.71 and 685.28

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Solution

The fourth proportional to 918.56, 1,267.71 and 685.28 is: 945.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.56 : 1,267.71 = 685.28 : x
  2. Step 2: Convert to fraction form
    918.56/1,267.71 = 685.28/x
  3. Step 3: Cross multiply
    918.56x = 1,267.71 × 685.28
  4. Step 4: Simplify right side
    918.56x = 868,736.31
  5. Step 5: Solve for x
    x = 868,736.31/918.56
  6. Step 6: Final answer
    x = 945.76

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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.