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Finding the Fourth Proportional to 5,791, 8,690.38 and 2,143

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Solution

The fourth proportional to 5,791, 8,690.38 and 2,143 is: 3,215.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,791 : 8,690.38 = 2,143 : x
  2. Step 2: Convert to fraction form
    5,791/8,690.38 = 2,143/x
  3. Step 3: Cross multiply
    5,791x = 8,690.38 × 2,143
  4. Step 4: Simplify right side
    5,791x = 18,623,484.34
  5. Step 5: Solve for x
    x = 18,623,484.34/5,791
  6. Step 6: Final answer
    x = 3,215.94

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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.