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Finding the Fourth Proportional to 936.64, 1,403.94 and 388.24

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Solution

The fourth proportional to 936.64, 1,403.94 and 388.24 is: 581.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.64 : 1,403.94 = 388.24 : x
  2. Step 2: Convert to fraction form
    936.64/1,403.94 = 388.24/x
  3. Step 3: Cross multiply
    936.64x = 1,403.94 × 388.24
  4. Step 4: Simplify right side
    936.64x = 545,065.67
  5. Step 5: Solve for x
    x = 545,065.67/936.64
  6. Step 6: Final answer
    x = 581.94

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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.