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Finding the Fourth Proportional to 918.36, 1,268.04 and 721.50

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Solution

The fourth proportional to 918.36, 1,268.04 and 721.50 is: 996.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.36 : 1,268.04 = 721.50 : x
  2. Step 2: Convert to fraction form
    918.36/1,268.04 = 721.50/x
  3. Step 3: Cross multiply
    918.36x = 1,268.04 × 721.50
  4. Step 4: Simplify right side
    918.36x = 914,890.86
  5. Step 5: Solve for x
    x = 914,890.86/918.36
  6. Step 6: Final answer
    x = 996.22

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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.