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Finding the Fourth Proportional to 919.44, 1,268.80 and 521.12

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Solution

The fourth proportional to 919.44, 1,268.80 and 521.12 is: 719.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.44 : 1,268.80 = 521.12 : x
  2. Step 2: Convert to fraction form
    919.44/1,268.80 = 521.12/x
  3. Step 3: Cross multiply
    919.44x = 1,268.80 × 521.12
  4. Step 4: Simplify right side
    919.44x = 661,197.06
  5. Step 5: Solve for x
    x = 661,197.06/919.44
  6. Step 6: Final answer
    x = 719.13

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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.