Home / 1,274.72-1,749.60-1,221.28

Finding the Fourth Proportional to 1,274.72, 1,749.60 and 1,221.28

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Solution

The fourth proportional to 1,274.72, 1,749.60 and 1,221.28 is: 1,676.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.72 : 1,749.60 = 1,221.28 : x
  2. Step 2: Convert to fraction form
    1,274.72/1,749.60 = 1,221.28/x
  3. Step 3: Cross multiply
    1,274.72x = 1,749.60 × 1,221.28
  4. Step 4: Simplify right side
    1,274.72x = 2,136,751.49
  5. Step 5: Solve for x
    x = 2,136,751.49/1,274.72
  6. Step 6: Final answer
    x = 1,676.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.