Home / 2,172.59-2,998.40-1,288.47

Finding the Fourth Proportional to 2,172.59, 2,998.40 and 1,288.47

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Solution

The fourth proportional to 2,172.59, 2,998.40 and 1,288.47 is: 1,778.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.59 : 2,998.40 = 1,288.47 : x
  2. Step 2: Convert to fraction form
    2,172.59/2,998.40 = 1,288.47/x
  3. Step 3: Cross multiply
    2,172.59x = 2,998.40 × 1,288.47
  4. Step 4: Simplify right side
    2,172.59x = 3,863,342.01
  5. Step 5: Solve for x
    x = 3,863,342.01/2,172.59
  6. Step 6: Final answer
    x = 1,778.22

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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.