Home / 1,921.75-2,650.79-1,175.40

Finding the Fourth Proportional to 1,921.75, 2,650.79 and 1,175.40

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Solution

The fourth proportional to 1,921.75, 2,650.79 and 1,175.40 is: 1,621.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.75 : 2,650.79 = 1,175.40 : x
  2. Step 2: Convert to fraction form
    1,921.75/2,650.79 = 1,175.40/x
  3. Step 3: Cross multiply
    1,921.75x = 2,650.79 × 1,175.40
  4. Step 4: Simplify right side
    1,921.75x = 3,115,741.50
  5. Step 5: Solve for x
    x = 3,115,741.50/1,921.75
  6. Step 6: Final answer
    x = 1,621.31

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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.