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Finding the Fourth Proportional to 937.58, 1,405.21 and 389.21

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Solution

The fourth proportional to 937.58, 1,405.21 and 389.21 is: 583.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.58 : 1,405.21 = 389.21 : x
  2. Step 2: Convert to fraction form
    937.58/1,405.21 = 389.21/x
  3. Step 3: Cross multiply
    937.58x = 1,405.21 × 389.21
  4. Step 4: Simplify right side
    937.58x = 546,921.78
  5. Step 5: Solve for x
    x = 546,921.78/937.58
  6. Step 6: Final answer
    x = 583.33

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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.