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Finding the Fourth Proportional to 930.87, 1,395.46 and 382.70

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Solution

The fourth proportional to 930.87, 1,395.46 and 382.70 is: 573.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.87 : 1,395.46 = 382.70 : x
  2. Step 2: Convert to fraction form
    930.87/1,395.46 = 382.70/x
  3. Step 3: Cross multiply
    930.87x = 1,395.46 × 382.70
  4. Step 4: Simplify right side
    930.87x = 534,046.51
  5. Step 5: Solve for x
    x = 534,046.51/930.87
  6. Step 6: Final answer
    x = 573.71

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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.