Home / 2,153.25-2,971.49-1,221.75

Finding the Fourth Proportional to 2,153.25, 2,971.49 and 1,221.75

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Solution

The fourth proportional to 2,153.25, 2,971.49 and 1,221.75 is: 1,686.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.25 : 2,971.49 = 1,221.75 : x
  2. Step 2: Convert to fraction form
    2,153.25/2,971.49 = 1,221.75/x
  3. Step 3: Cross multiply
    2,153.25x = 2,971.49 × 1,221.75
  4. Step 4: Simplify right side
    2,153.25x = 3,630,411.80
  5. Step 5: Solve for x
    x = 3,630,411.80/2,153.25
  6. Step 6: Final answer
    x = 1,686.02

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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.