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Finding the Fourth Proportional to 2,104.79, 3,157.75 and 643.91

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Solution

The fourth proportional to 2,104.79, 3,157.75 and 643.91 is: 966.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,104.79 : 3,157.75 = 643.91 : x
  2. Step 2: Convert to fraction form
    2,104.79/3,157.75 = 643.91/x
  3. Step 3: Cross multiply
    2,104.79x = 3,157.75 × 643.91
  4. Step 4: Simplify right side
    2,104.79x = 2,033,291.01
  5. Step 5: Solve for x
    x = 2,033,291.01/2,104.79
  6. Step 6: Final answer
    x = 966.03

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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.