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Finding the Fourth Proportional to 845.76, 1,268.25 and 455.64

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Solution

The fourth proportional to 845.76, 1,268.25 and 455.64 is: 683.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.76 : 1,268.25 = 455.64 : x
  2. Step 2: Convert to fraction form
    845.76/1,268.25 = 455.64/x
  3. Step 3: Cross multiply
    845.76x = 1,268.25 × 455.64
  4. Step 4: Simplify right side
    845.76x = 577,865.43
  5. Step 5: Solve for x
    x = 577,865.43/845.76
  6. Step 6: Final answer
    x = 683.25

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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.