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Finding the Fourth Proportional to 287,676.21, 431,662.20 and 220,638.87

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Solution

The fourth proportional to 287,676.21, 431,662.20 and 220,638.87 is: 331,071.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,676.21 : 431,662.20 = 220,638.87 : x
  2. Step 2: Convert to fraction form
    287,676.21/431,662.20 = 220,638.87/x
  3. Step 3: Cross multiply
    287,676.21x = 431,662.20 × 220,638.87
  4. Step 4: Simplify right side
    287,676.21x = 95,241,460,029.71
  5. Step 5: Solve for x
    x = 95,241,460,029.71/287,676.21
  6. Step 6: Final answer
    x = 331,071.73

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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.