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Finding the Fourth Proportional to 1,206.28, 1,664.40 and 682.12

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Solution

The fourth proportional to 1,206.28, 1,664.40 and 682.12 is: 941.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.28 : 1,664.40 = 682.12 : x
  2. Step 2: Convert to fraction form
    1,206.28/1,664.40 = 682.12/x
  3. Step 3: Cross multiply
    1,206.28x = 1,664.40 × 682.12
  4. Step 4: Simplify right side
    1,206.28x = 1,135,320.53
  5. Step 5: Solve for x
    x = 1,135,320.53/1,206.28
  6. Step 6: Final answer
    x = 941.17

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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.