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Finding the Fourth Proportional to 1,230.49, 1,698.09 and 670.97

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Solution

The fourth proportional to 1,230.49, 1,698.09 and 670.97 is: 925.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.49 : 1,698.09 = 670.97 : x
  2. Step 2: Convert to fraction form
    1,230.49/1,698.09 = 670.97/x
  3. Step 3: Cross multiply
    1,230.49x = 1,698.09 × 670.97
  4. Step 4: Simplify right side
    1,230.49x = 1,139,367.45
  5. Step 5: Solve for x
    x = 1,139,367.45/1,230.49
  6. Step 6: Final answer
    x = 925.95

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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.