Home / 2,122.76-2,929.40-1,191.28

Finding the Fourth Proportional to 2,122.76, 2,929.40 and 1,191.28

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Solution

The fourth proportional to 2,122.76, 2,929.40 and 1,191.28 is: 1,643.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,122.76 : 2,929.40 = 1,191.28 : x
  2. Step 2: Convert to fraction form
    2,122.76/2,929.40 = 1,191.28/x
  3. Step 3: Cross multiply
    2,122.76x = 2,929.40 × 1,191.28
  4. Step 4: Simplify right side
    2,122.76x = 3,489,735.63
  5. Step 5: Solve for x
    x = 3,489,735.63/2,122.76
  6. Step 6: Final answer
    x = 1,643.96

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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.