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Finding the Fourth Proportional to 845.74, 1,268.40 and 290.38

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Solution

The fourth proportional to 845.74, 1,268.40 and 290.38 is: 435.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.74 : 1,268.40 = 290.38 : x
  2. Step 2: Convert to fraction form
    845.74/1,268.40 = 290.38/x
  3. Step 3: Cross multiply
    845.74x = 1,268.40 × 290.38
  4. Step 4: Simplify right side
    845.74x = 368,316.54
  5. Step 5: Solve for x
    x = 368,316.54/845.74
  6. Step 6: Final answer
    x = 435.50

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Double scale
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1.5x scale

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.