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Finding the Fourth Proportional to 1,616.85, 2,426.42 and 643.17

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Solution

The fourth proportional to 1,616.85, 2,426.42 and 643.17 is: 965.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,616.85 : 2,426.42 = 643.17 : x
  2. Step 2: Convert to fraction form
    1,616.85/2,426.42 = 643.17/x
  3. Step 3: Cross multiply
    1,616.85x = 2,426.42 × 643.17
  4. Step 4: Simplify right side
    1,616.85x = 1,560,600.55
  5. Step 5: Solve for x
    x = 1,560,600.55/1,616.85
  6. Step 6: Final answer
    x = 965.21

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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.