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Finding the Fourth Proportional to 845.17, 1,268.71 and 638.01

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Solution

The fourth proportional to 845.17, 1,268.71 and 638.01 is: 957.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.17 : 1,268.71 = 638.01 : x
  2. Step 2: Convert to fraction form
    845.17/1,268.71 = 638.01/x
  3. Step 3: Cross multiply
    845.17x = 1,268.71 × 638.01
  4. Step 4: Simplify right side
    845.17x = 809,451.66
  5. Step 5: Solve for x
    x = 809,451.66/845.17
  6. Step 6: Final answer
    x = 957.74

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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.