Home / 2,153.31-2,971.62-1,221.81

Finding the Fourth Proportional to 2,153.31, 2,971.62 and 1,221.81

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Solution

The fourth proportional to 2,153.31, 2,971.62 and 1,221.81 is: 1,686.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.31 : 2,971.62 = 1,221.81 : x
  2. Step 2: Convert to fraction form
    2,153.31/2,971.62 = 1,221.81/x
  3. Step 3: Cross multiply
    2,153.31x = 2,971.62 × 1,221.81
  4. Step 4: Simplify right side
    2,153.31x = 3,630,755.03
  5. Step 5: Solve for x
    x = 3,630,755.03/2,153.31
  6. Step 6: Final answer
    x = 1,686.13

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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.