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Finding the Fourth Proportional to 845.42, 1,268.12 and 520.20

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Solution

The fourth proportional to 845.42, 1,268.12 and 520.20 is: 780.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.42 : 1,268.12 = 520.20 : x
  2. Step 2: Convert to fraction form
    845.42/1,268.12 = 520.20/x
  3. Step 3: Cross multiply
    845.42x = 1,268.12 × 520.20
  4. Step 4: Simplify right side
    845.42x = 659,676.02
  5. Step 5: Solve for x
    x = 659,676.02/845.42
  6. Step 6: Final answer
    x = 780.29

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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.