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Finding the Fourth Proportional to 846.64, 1,268.59 and 640.93

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Solution

The fourth proportional to 846.64, 1,268.59 and 640.93 is: 960.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    846.64 : 1,268.59 = 640.93 : x
  2. Step 2: Convert to fraction form
    846.64/1,268.59 = 640.93/x
  3. Step 3: Cross multiply
    846.64x = 1,268.59 × 640.93
  4. Step 4: Simplify right side
    846.64x = 813,077.39
  5. Step 5: Solve for x
    x = 813,077.39/846.64
  6. Step 6: Final answer
    x = 960.36

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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.