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Finding the Fourth Proportional to 930.03, 1,395.21 and 443.61

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Solution

The fourth proportional to 930.03, 1,395.21 and 443.61 is: 665.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.03 : 1,395.21 = 443.61 : x
  2. Step 2: Convert to fraction form
    930.03/1,395.21 = 443.61/x
  3. Step 3: Cross multiply
    930.03x = 1,395.21 × 443.61
  4. Step 4: Simplify right side
    930.03x = 618,929.11
  5. Step 5: Solve for x
    x = 618,929.11/930.03
  6. Step 6: Final answer
    x = 665.49

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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.