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Finding the Fourth Proportional to 919.64, 1,268.72 and 570.12

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Solution

The fourth proportional to 919.64, 1,268.72 and 570.12 is: 786.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.64 : 1,268.72 = 570.12 : x
  2. Step 2: Convert to fraction form
    919.64/1,268.72 = 570.12/x
  3. Step 3: Cross multiply
    919.64x = 1,268.72 × 570.12
  4. Step 4: Simplify right side
    919.64x = 723,322.65
  5. Step 5: Solve for x
    x = 723,322.65/919.64
  6. Step 6: Final answer
    x = 786.53

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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.