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Finding the Fourth Proportional to 936.79, 1,405.12 and 388.57

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Solution

The fourth proportional to 936.79, 1,405.12 and 388.57 is: 582.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.79 : 1,405.12 = 388.57 : x
  2. Step 2: Convert to fraction form
    936.79/1,405.12 = 388.57/x
  3. Step 3: Cross multiply
    936.79x = 1,405.12 × 388.57
  4. Step 4: Simplify right side
    936.79x = 545,987.48
  5. Step 5: Solve for x
    x = 545,987.48/936.79
  6. Step 6: Final answer
    x = 582.83

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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.