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Finding the Fourth Proportional to 1,290.86, 1,936.32 and 316.97

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Solution

The fourth proportional to 1,290.86, 1,936.32 and 316.97 is: 475.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.86 : 1,936.32 = 316.97 : x
  2. Step 2: Convert to fraction form
    1,290.86/1,936.32 = 316.97/x
  3. Step 3: Cross multiply
    1,290.86x = 1,936.32 × 316.97
  4. Step 4: Simplify right side
    1,290.86x = 613,761.38
  5. Step 5: Solve for x
    x = 613,761.38/1,290.86
  6. Step 6: Final answer
    x = 475.47

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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.