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Finding the Fourth Proportional to 918.44, 1,266.80 and 648.83

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Solution

The fourth proportional to 918.44, 1,266.80 and 648.83 is: 894.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.44 : 1,266.80 = 648.83 : x
  2. Step 2: Convert to fraction form
    918.44/1,266.80 = 648.83/x
  3. Step 3: Cross multiply
    918.44x = 1,266.80 × 648.83
  4. Step 4: Simplify right side
    918.44x = 821,928.27
  5. Step 5: Solve for x
    x = 821,928.27/918.44
  6. Step 6: Final answer
    x = 894.92

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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.