Home / 2,172.66-2,997.18-1,387.38

Finding the Fourth Proportional to 2,172.66, 2,997.18 and 1,387.38

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Solution

The fourth proportional to 2,172.66, 2,997.18 and 1,387.38 is: 1,913.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.66 : 2,997.18 = 1,387.38 : x
  2. Step 2: Convert to fraction form
    2,172.66/2,997.18 = 1,387.38/x
  3. Step 3: Cross multiply
    2,172.66x = 2,997.18 × 1,387.38
  4. Step 4: Simplify right side
    2,172.66x = 4,158,227.59
  5. Step 5: Solve for x
    x = 4,158,227.59/2,172.66
  6. Step 6: Final answer
    x = 1,913.89

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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.