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Finding the Fourth Proportional to 928.05, 1,391.83 and 465.49

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Solution

The fourth proportional to 928.05, 1,391.83 and 465.49 is: 698.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.05 : 1,391.83 = 465.49 : x
  2. Step 2: Convert to fraction form
    928.05/1,391.83 = 465.49/x
  3. Step 3: Cross multiply
    928.05x = 1,391.83 × 465.49
  4. Step 4: Simplify right side
    928.05x = 647,882.95
  5. Step 5: Solve for x
    x = 647,882.95/928.05
  6. Step 6: Final answer
    x = 698.11

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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.