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Finding the Fourth Proportional to 920.35, 1,270.11 and 698.92

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Solution

The fourth proportional to 920.35, 1,270.11 and 698.92 is: 964.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.35 : 1,270.11 = 698.92 : x
  2. Step 2: Convert to fraction form
    920.35/1,270.11 = 698.92/x
  3. Step 3: Cross multiply
    920.35x = 1,270.11 × 698.92
  4. Step 4: Simplify right side
    920.35x = 887,704.73
  5. Step 5: Solve for x
    x = 887,704.73/920.35
  6. Step 6: Final answer
    x = 964.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.