Home / 1,212.20-1,818.57-664.10

Finding the Fourth Proportional to 1,212.20, 1,818.57 and 664.10

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Solution

The fourth proportional to 1,212.20, 1,818.57 and 664.10 is: 996.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.20 : 1,818.57 = 664.10 : x
  2. Step 2: Convert to fraction form
    1,212.20/1,818.57 = 664.10/x
  3. Step 3: Cross multiply
    1,212.20x = 1,818.57 × 664.10
  4. Step 4: Simplify right side
    1,212.20x = 1,207,712.34
  5. Step 5: Solve for x
    x = 1,207,712.34/1,212.20
  6. Step 6: Final answer
    x = 996.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.