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Finding the Fourth Proportional to 930.20, 1,395.60 and 622.40

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Solution

The fourth proportional to 930.20, 1,395.60 and 622.40 is: 933.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.20 : 1,395.60 = 622.40 : x
  2. Step 2: Convert to fraction form
    930.20/1,395.60 = 622.40/x
  3. Step 3: Cross multiply
    930.20x = 1,395.60 × 622.40
  4. Step 4: Simplify right side
    930.20x = 868,621.44
  5. Step 5: Solve for x
    x = 868,621.44/930.20
  6. Step 6: Final answer
    x = 933.80

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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.