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Finding the Fourth Proportional to 2,287.22, 3,430.92 and 643.88

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Solution

The fourth proportional to 2,287.22, 3,430.92 and 643.88 is: 965.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,287.22 : 3,430.92 = 643.88 : x
  2. Step 2: Convert to fraction form
    2,287.22/3,430.92 = 643.88/x
  3. Step 3: Cross multiply
    2,287.22x = 3,430.92 × 643.88
  4. Step 4: Simplify right side
    2,287.22x = 2,209,100.77
  5. Step 5: Solve for x
    x = 2,209,100.77/2,287.22
  6. Step 6: Final answer
    x = 965.85

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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.