Home / 1,620.40-2,236.26-921.82

Finding the Fourth Proportional to 1,620.40, 2,236.26 and 921.82

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Solution

The fourth proportional to 1,620.40, 2,236.26 and 921.82 is: 1,272.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.40 : 2,236.26 = 921.82 : x
  2. Step 2: Convert to fraction form
    1,620.40/2,236.26 = 921.82/x
  3. Step 3: Cross multiply
    1,620.40x = 2,236.26 × 921.82
  4. Step 4: Simplify right side
    1,620.40x = 2,061,429.19
  5. Step 5: Solve for x
    x = 2,061,429.19/1,620.40
  6. Step 6: Final answer
    x = 1,272.17

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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.