Home / 1,620.36-2,236.10-921.74

Finding the Fourth Proportional to 1,620.36, 2,236.10 and 921.74

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Solution

The fourth proportional to 1,620.36, 2,236.10 and 921.74 is: 1,272.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.36 : 2,236.10 = 921.74 : x
  2. Step 2: Convert to fraction form
    1,620.36/2,236.10 = 921.74/x
  3. Step 3: Cross multiply
    1,620.36x = 2,236.10 × 921.74
  4. Step 4: Simplify right side
    1,620.36x = 2,061,102.81
  5. Step 5: Solve for x
    x = 2,061,102.81/1,620.36
  6. Step 6: Final answer
    x = 1,272.00

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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.