Home / 2,116.96-2,921.40-1,172.80

Finding the Fourth Proportional to 2,116.96, 2,921.40 and 1,172.80

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Solution

The fourth proportional to 2,116.96, 2,921.40 and 1,172.80 is: 1,618.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,116.96 : 2,921.40 = 1,172.80 : x
  2. Step 2: Convert to fraction form
    2,116.96/2,921.40 = 1,172.80/x
  3. Step 3: Cross multiply
    2,116.96x = 2,921.40 × 1,172.80
  4. Step 4: Simplify right side
    2,116.96x = 3,426,217.92
  5. Step 5: Solve for x
    x = 3,426,217.92/2,116.96
  6. Step 6: Final answer
    x = 1,618.46

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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.