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Finding the Fourth Proportional to 1,620.10, 2,428.55 and 644.90

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Solution

The fourth proportional to 1,620.10, 2,428.55 and 644.90 is: 966.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.10 : 2,428.55 = 644.90 : x
  2. Step 2: Convert to fraction form
    1,620.10/2,428.55 = 644.90/x
  3. Step 3: Cross multiply
    1,620.10x = 2,428.55 × 644.90
  4. Step 4: Simplify right side
    1,620.10x = 1,566,171.90
  5. Step 5: Solve for x
    x = 1,566,171.90/1,620.10
  6. Step 6: Final answer
    x = 966.71

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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.