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Finding the Fourth Proportional to 1,218.05, 1,680.99 and 694.07

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Solution

The fourth proportional to 1,218.05, 1,680.99 and 694.07 is: 957.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.05 : 1,680.99 = 694.07 : x
  2. Step 2: Convert to fraction form
    1,218.05/1,680.99 = 694.07/x
  3. Step 3: Cross multiply
    1,218.05x = 1,680.99 × 694.07
  4. Step 4: Simplify right side
    1,218.05x = 1,166,724.73
  5. Step 5: Solve for x
    x = 1,166,724.73/1,218.05
  6. Step 6: Final answer
    x = 957.86

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1.5x scale

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.