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Finding the Fourth Proportional to 2,104.74, 3,157.01 and 643.79

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Solution

The fourth proportional to 2,104.74, 3,157.01 and 643.79 is: 965.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,104.74 : 3,157.01 = 643.79 : x
  2. Step 2: Convert to fraction form
    2,104.74/3,157.01 = 643.79/x
  3. Step 3: Cross multiply
    2,104.74x = 3,157.01 × 643.79
  4. Step 4: Simplify right side
    2,104.74x = 2,032,432.46
  5. Step 5: Solve for x
    x = 2,032,432.46/2,104.74
  6. Step 6: Final answer
    x = 965.65

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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.