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Finding the Fourth Proportional to 936.36, 1,403.88 and 388.40

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Solution

The fourth proportional to 936.36, 1,403.88 and 388.40 is: 582.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.36 : 1,403.88 = 388.40 : x
  2. Step 2: Convert to fraction form
    936.36/1,403.88 = 388.40/x
  3. Step 3: Cross multiply
    936.36x = 1,403.88 × 388.40
  4. Step 4: Simplify right side
    936.36x = 545,266.99
  5. Step 5: Solve for x
    x = 545,266.99/936.36
  6. Step 6: Final answer
    x = 582.33

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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.