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Finding the Fourth Proportional to 918.74, 1,268.03 and 603.44

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Solution

The fourth proportional to 918.74, 1,268.03 and 603.44 is: 832.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.74 : 1,268.03 = 603.44 : x
  2. Step 2: Convert to fraction form
    918.74/1,268.03 = 603.44/x
  3. Step 3: Cross multiply
    918.74x = 1,268.03 × 603.44
  4. Step 4: Simplify right side
    918.74x = 765,184.70
  5. Step 5: Solve for x
    x = 765,184.70/918.74
  6. Step 6: Final answer
    x = 832.87

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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.