Home / 1,218.46-1,682.27-938.20

Finding the Fourth Proportional to 1,218.46, 1,682.27 and 938.20

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Solution

The fourth proportional to 1,218.46, 1,682.27 and 938.20 is: 1,295.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.46 : 1,682.27 = 938.20 : x
  2. Step 2: Convert to fraction form
    1,218.46/1,682.27 = 938.20/x
  3. Step 3: Cross multiply
    1,218.46x = 1,682.27 × 938.20
  4. Step 4: Simplify right side
    1,218.46x = 1,578,305.71
  5. Step 5: Solve for x
    x = 1,578,305.71/1,218.46
  6. Step 6: Final answer
    x = 1,295.33

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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.