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Finding the Fourth Proportional to 1,218.28, 1,680.81 and 694.18

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Solution

The fourth proportional to 1,218.28, 1,680.81 and 694.18 is: 957.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.28 : 1,680.81 = 694.18 : x
  2. Step 2: Convert to fraction form
    1,218.28/1,680.81 = 694.18/x
  3. Step 3: Cross multiply
    1,218.28x = 1,680.81 × 694.18
  4. Step 4: Simplify right side
    1,218.28x = 1,166,784.69
  5. Step 5: Solve for x
    x = 1,166,784.69/1,218.28
  6. Step 6: Final answer
    x = 957.73

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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.