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Finding the Fourth Proportional to 936.58, 1,403.96 and 389.16

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Solution

The fourth proportional to 936.58, 1,403.96 and 389.16 is: 583.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.58 : 1,403.96 = 389.16 : x
  2. Step 2: Convert to fraction form
    936.58/1,403.96 = 389.16/x
  3. Step 3: Cross multiply
    936.58x = 1,403.96 × 389.16
  4. Step 4: Simplify right side
    936.58x = 546,365.07
  5. Step 5: Solve for x
    x = 546,365.07/936.58
  6. Step 6: Final answer
    x = 583.36

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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.