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Finding the Fourth Proportional to 919.40, 1,268.32 and 570.04

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Solution

The fourth proportional to 919.40, 1,268.32 and 570.04 is: 786.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.40 : 1,268.32 = 570.04 : x
  2. Step 2: Convert to fraction form
    919.40/1,268.32 = 570.04/x
  3. Step 3: Cross multiply
    919.40x = 1,268.32 × 570.04
  4. Step 4: Simplify right side
    919.40x = 722,993.13
  5. Step 5: Solve for x
    x = 722,993.13/919.40
  6. Step 6: Final answer
    x = 786.37

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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.