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Finding the Fourth Proportional to 846.93, 1,268.58 and 639.21

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Solution

The fourth proportional to 846.93, 1,268.58 and 639.21 is: 957.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    846.93 : 1,268.58 = 639.21 : x
  2. Step 2: Convert to fraction form
    846.93/1,268.58 = 639.21/x
  3. Step 3: Cross multiply
    846.93x = 1,268.58 × 639.21
  4. Step 4: Simplify right side
    846.93x = 810,889.02
  5. Step 5: Solve for x
    x = 810,889.02/846.93
  6. Step 6: Final answer
    x = 957.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.