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Finding the Fourth Proportional to 845.94, 1,268.90 and 641.76

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Solution

The fourth proportional to 845.94, 1,268.90 and 641.76 is: 962.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.94 : 1,268.90 = 641.76 : x
  2. Step 2: Convert to fraction form
    845.94/1,268.90 = 641.76/x
  3. Step 3: Cross multiply
    845.94x = 1,268.90 × 641.76
  4. Step 4: Simplify right side
    845.94x = 814,327.27
  5. Step 5: Solve for x
    x = 814,327.27/845.94
  6. Step 6: Final answer
    x = 962.63

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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.