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Finding the Fourth Proportional to 1,617.99, 2,428.20 and 643.56

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Solution

The fourth proportional to 1,617.99, 2,428.20 and 643.56 is: 965.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,617.99 : 2,428.20 = 643.56 : x
  2. Step 2: Convert to fraction form
    1,617.99/2,428.20 = 643.56/x
  3. Step 3: Cross multiply
    1,617.99x = 2,428.20 × 643.56
  4. Step 4: Simplify right side
    1,617.99x = 1,562,692.39
  5. Step 5: Solve for x
    x = 1,562,692.39/1,617.99
  6. Step 6: Final answer
    x = 965.82

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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.