Home / 2,172.80-2,997.96-1,386.56

Finding the Fourth Proportional to 2,172.80, 2,997.96 and 1,386.56

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Solution

The fourth proportional to 2,172.80, 2,997.96 and 1,386.56 is: 1,913.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.80 : 2,997.96 = 1,386.56 : x
  2. Step 2: Convert to fraction form
    2,172.80/2,997.96 = 1,386.56/x
  3. Step 3: Cross multiply
    2,172.80x = 2,997.96 × 1,386.56
  4. Step 4: Simplify right side
    2,172.80x = 4,156,851.42
  5. Step 5: Solve for x
    x = 4,156,851.42/2,172.80
  6. Step 6: Final answer
    x = 1,913.13

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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.