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Finding the Fourth Proportional to 918.83, 1,268.54 and 620.60

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Solution

The fourth proportional to 918.83, 1,268.54 and 620.60 is: 856.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.83 : 1,268.54 = 620.60 : x
  2. Step 2: Convert to fraction form
    918.83/1,268.54 = 620.60/x
  3. Step 3: Cross multiply
    918.83x = 1,268.54 × 620.60
  4. Step 4: Simplify right side
    918.83x = 787,255.99
  5. Step 5: Solve for x
    x = 787,255.99/918.83
  6. Step 6: Final answer
    x = 856.80

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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.