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Finding the Fourth Proportional to 1,228.16, 1,694.85 and 668.63

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Solution

The fourth proportional to 1,228.16, 1,694.85 and 668.63 is: 922.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.16 : 1,694.85 = 668.63 : x
  2. Step 2: Convert to fraction form
    1,228.16/1,694.85 = 668.63/x
  3. Step 3: Cross multiply
    1,228.16x = 1,694.85 × 668.63
  4. Step 4: Simplify right side
    1,228.16x = 1,133,227.56
  5. Step 5: Solve for x
    x = 1,133,227.56/1,228.16
  6. Step 6: Final answer
    x = 922.70

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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.