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Finding the Fourth Proportional to 918.77, 1,268.04 and 888.39

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Solution

The fourth proportional to 918.77, 1,268.04 and 888.39 is: 1,226.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.77 : 1,268.04 = 888.39 : x
  2. Step 2: Convert to fraction form
    918.77/1,268.04 = 888.39/x
  3. Step 3: Cross multiply
    918.77x = 1,268.04 × 888.39
  4. Step 4: Simplify right side
    918.77x = 1,126,514.06
  5. Step 5: Solve for x
    x = 1,126,514.06/918.77
  6. Step 6: Final answer
    x = 1,226.12

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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.