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Finding the Fourth Proportional to 930.65, 1,395.43 and 382.21

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Solution

The fourth proportional to 930.65, 1,395.43 and 382.21 is: 573.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.65 : 1,395.43 = 382.21 : x
  2. Step 2: Convert to fraction form
    930.65/1,395.43 = 382.21/x
  3. Step 3: Cross multiply
    930.65x = 1,395.43 × 382.21
  4. Step 4: Simplify right side
    930.65x = 533,342.86
  5. Step 5: Solve for x
    x = 533,342.86/930.65
  6. Step 6: Final answer
    x = 573.09

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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.