Home / 1,215.10-1,676.20-919.86

Finding the Fourth Proportional to 1,215.10, 1,676.20 and 919.86

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Solution

The fourth proportional to 1,215.10, 1,676.20 and 919.86 is: 1,268.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.10 : 1,676.20 = 919.86 : x
  2. Step 2: Convert to fraction form
    1,215.10/1,676.20 = 919.86/x
  3. Step 3: Cross multiply
    1,215.10x = 1,676.20 × 919.86
  4. Step 4: Simplify right side
    1,215.10x = 1,541,869.33
  5. Step 5: Solve for x
    x = 1,541,869.33/1,215.10
  6. Step 6: Final answer
    x = 1,268.92

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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.