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Finding the Fourth Proportional to 936.80, 1,403.76 and 388.88

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Solution

The fourth proportional to 936.80, 1,403.76 and 388.88 is: 582.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.80 : 1,403.76 = 388.88 : x
  2. Step 2: Convert to fraction form
    936.80/1,403.76 = 388.88/x
  3. Step 3: Cross multiply
    936.80x = 1,403.76 × 388.88
  4. Step 4: Simplify right side
    936.80x = 545,894.19
  5. Step 5: Solve for x
    x = 545,894.19/936.80
  6. Step 6: Final answer
    x = 582.72

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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.