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Finding the Fourth Proportional to 1,289.44, 1,934.16 and 315.54

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Solution

The fourth proportional to 1,289.44, 1,934.16 and 315.54 is: 473.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.44 : 1,934.16 = 315.54 : x
  2. Step 2: Convert to fraction form
    1,289.44/1,934.16 = 315.54/x
  3. Step 3: Cross multiply
    1,289.44x = 1,934.16 × 315.54
  4. Step 4: Simplify right side
    1,289.44x = 610,304.85
  5. Step 5: Solve for x
    x = 610,304.85/1,289.44
  6. Step 6: Final answer
    x = 473.31

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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.