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Finding the Fourth Proportional to 930.20, 1,391.70 and 606.20

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Solution

The fourth proportional to 930.20, 1,391.70 and 606.20 is: 906.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.20 : 1,391.70 = 606.20 : x
  2. Step 2: Convert to fraction form
    930.20/1,391.70 = 606.20/x
  3. Step 3: Cross multiply
    930.20x = 1,391.70 × 606.20
  4. Step 4: Simplify right side
    930.20x = 843,648.54
  5. Step 5: Solve for x
    x = 843,648.54/930.20
  6. Step 6: Final answer
    x = 906.95

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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.