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Finding the Fourth Proportional to 2,160.70, 2,980.62 and 1,321.82

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Solution

The fourth proportional to 2,160.70, 2,980.62 and 1,321.82 is: 1,823.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,160.70 : 2,980.62 = 1,321.82 : x
  2. Step 2: Convert to fraction form
    2,160.70/2,980.62 = 1,321.82/x
  3. Step 3: Cross multiply
    2,160.70x = 2,980.62 × 1,321.82
  4. Step 4: Simplify right side
    2,160.70x = 3,939,843.13
  5. Step 5: Solve for x
    x = 3,939,843.13/2,160.70
  6. Step 6: Final answer
    x = 1,823.41

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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.