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Finding the Fourth Proportional to 1,616.83, 2,425.26 and 643.18

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Solution

The fourth proportional to 1,616.83, 2,425.26 and 643.18 is: 964.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,616.83 : 2,425.26 = 643.18 : x
  2. Step 2: Convert to fraction form
    1,616.83/2,425.26 = 643.18/x
  3. Step 3: Cross multiply
    1,616.83x = 2,425.26 × 643.18
  4. Step 4: Simplify right side
    1,616.83x = 1,559,878.73
  5. Step 5: Solve for x
    x = 1,559,878.73/1,616.83
  6. Step 6: Final answer
    x = 964.78

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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.