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Finding the Fourth Proportional to 2,104.65, 3,156.75 and 643.80

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Solution

The fourth proportional to 2,104.65, 3,156.75 and 643.80 is: 965.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,104.65 : 3,156.75 = 643.80 : x
  2. Step 2: Convert to fraction form
    2,104.65/3,156.75 = 643.80/x
  3. Step 3: Cross multiply
    2,104.65x = 3,156.75 × 643.80
  4. Step 4: Simplify right side
    2,104.65x = 2,032,315.65
  5. Step 5: Solve for x
    x = 2,032,315.65/2,104.65
  6. Step 6: Final answer
    x = 965.63

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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.