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Finding the Fourth Proportional to 937.36, 1,405.38 and 389.40

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Solution

The fourth proportional to 937.36, 1,405.38 and 389.40 is: 583.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.36 : 1,405.38 = 389.40 : x
  2. Step 2: Convert to fraction form
    937.36/1,405.38 = 389.40/x
  3. Step 3: Cross multiply
    937.36x = 1,405.38 × 389.40
  4. Step 4: Simplify right side
    937.36x = 547,254.97
  5. Step 5: Solve for x
    x = 547,254.97/937.36
  6. Step 6: Final answer
    x = 583.83

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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.