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Finding the Fourth Proportional to 1,213.20, 1,674.22 and 682.10

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Solution

The fourth proportional to 1,213.20, 1,674.22 and 682.10 is: 941.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.20 : 1,674.22 = 682.10 : x
  2. Step 2: Convert to fraction form
    1,213.20/1,674.22 = 682.10/x
  3. Step 3: Cross multiply
    1,213.20x = 1,674.22 × 682.10
  4. Step 4: Simplify right side
    1,213.20x = 1,141,985.46
  5. Step 5: Solve for x
    x = 1,141,985.46/1,213.20
  6. Step 6: Final answer
    x = 941.30

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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.