Home / 1,620.51-2,236.46-921.75

Finding the Fourth Proportional to 1,620.51, 2,236.46 and 921.75

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Solution

The fourth proportional to 1,620.51, 2,236.46 and 921.75 is: 1,272.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.51 : 2,236.46 = 921.75 : x
  2. Step 2: Convert to fraction form
    1,620.51/2,236.46 = 921.75/x
  3. Step 3: Cross multiply
    1,620.51x = 2,236.46 × 921.75
  4. Step 4: Simplify right side
    1,620.51x = 2,061,452.40
  5. Step 5: Solve for x
    x = 2,061,452.40/1,620.51
  6. Step 6: Final answer
    x = 1,272.10

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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.