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Finding the Fourth Proportional to 1,293.28, 1,939.46 and 415.74

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Solution

The fourth proportional to 1,293.28, 1,939.46 and 415.74 is: 623.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.28 : 1,939.46 = 415.74 : x
  2. Step 2: Convert to fraction form
    1,293.28/1,939.46 = 415.74/x
  3. Step 3: Cross multiply
    1,293.28x = 1,939.46 × 415.74
  4. Step 4: Simplify right side
    1,293.28x = 806,316.29
  5. Step 5: Solve for x
    x = 806,316.29/1,293.28
  6. Step 6: Final answer
    x = 623.47

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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.