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Finding the Fourth Proportional to 845.12, 1,157.79 and 813.53

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Solution

The fourth proportional to 845.12, 1,157.79 and 813.53 is: 1,114.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.12 : 1,157.79 = 813.53 : x
  2. Step 2: Convert to fraction form
    845.12/1,157.79 = 813.53/x
  3. Step 3: Cross multiply
    845.12x = 1,157.79 × 813.53
  4. Step 4: Simplify right side
    845.12x = 941,891.97
  5. Step 5: Solve for x
    x = 941,891.97/845.12
  6. Step 6: Final answer
    x = 1,114.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.