Home / 2,172.53-2,998.10-1,288.39

Finding the Fourth Proportional to 2,172.53, 2,998.10 and 1,288.39

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Solution

The fourth proportional to 2,172.53, 2,998.10 and 1,288.39 is: 1,777.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.53 : 2,998.10 = 1,288.39 : x
  2. Step 2: Convert to fraction form
    2,172.53/2,998.10 = 1,288.39/x
  3. Step 3: Cross multiply
    2,172.53x = 2,998.10 × 1,288.39
  4. Step 4: Simplify right side
    2,172.53x = 3,862,722.06
  5. Step 5: Solve for x
    x = 3,862,722.06/2,172.53
  6. Step 6: Final answer
    x = 1,777.98

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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.