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Finding the Fourth Proportional to 919.83, 1,268.04 and 657.39

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Solution

The fourth proportional to 919.83, 1,268.04 and 657.39 is: 906.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.83 : 1,268.04 = 657.39 : x
  2. Step 2: Convert to fraction form
    919.83/1,268.04 = 657.39/x
  3. Step 3: Cross multiply
    919.83x = 1,268.04 × 657.39
  4. Step 4: Simplify right side
    919.83x = 833,604.04
  5. Step 5: Solve for x
    x = 833,604.04/919.83
  6. Step 6: Final answer
    x = 906.26

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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.