Home / 1,620.13-2,428.37-645.09

Finding the Fourth Proportional to 1,620.13, 2,428.37 and 645.09

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Solution

The fourth proportional to 1,620.13, 2,428.37 and 645.09 is: 966.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.13 : 2,428.37 = 645.09 : x
  2. Step 2: Convert to fraction form
    1,620.13/2,428.37 = 645.09/x
  3. Step 3: Cross multiply
    1,620.13x = 2,428.37 × 645.09
  4. Step 4: Simplify right side
    1,620.13x = 1,566,517.20
  5. Step 5: Solve for x
    x = 1,566,517.20/1,620.13
  6. Step 6: Final answer
    x = 966.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.