Home / 2,117.70-2,922.57-1,221.75

Finding the Fourth Proportional to 2,117.70, 2,922.57 and 1,221.75

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Solution

The fourth proportional to 2,117.70, 2,922.57 and 1,221.75 is: 1,686.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,117.70 : 2,922.57 = 1,221.75 : x
  2. Step 2: Convert to fraction form
    2,117.70/2,922.57 = 1,221.75/x
  3. Step 3: Cross multiply
    2,117.70x = 2,922.57 × 1,221.75
  4. Step 4: Simplify right side
    2,117.70x = 3,570,649.90
  5. Step 5: Solve for x
    x = 3,570,649.90/2,117.70
  6. Step 6: Final answer
    x = 1,686.10

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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.