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Finding the Fourth Proportional to 1,289.86, 1,934.79 and 365.41

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Solution

The fourth proportional to 1,289.86, 1,934.79 and 365.41 is: 548.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.86 : 1,934.79 = 365.41 : x
  2. Step 2: Convert to fraction form
    1,289.86/1,934.79 = 365.41/x
  3. Step 3: Cross multiply
    1,289.86x = 1,934.79 × 365.41
  4. Step 4: Simplify right side
    1,289.86x = 706,986.78
  5. Step 5: Solve for x
    x = 706,986.78/1,289.86
  6. Step 6: Final answer
    x = 548.11

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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.