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Finding the Fourth Proportional to 7,821, 11,720.28 and 5,871

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Solution

The fourth proportional to 7,821, 11,720.28 and 5,871 is: 8,798.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,821 : 11,720.28 = 5,871 : x
  2. Step 2: Convert to fraction form
    7,821/11,720.28 = 5,871/x
  3. Step 3: Cross multiply
    7,821x = 11,720.28 × 5,871
  4. Step 4: Simplify right side
    7,821x = 68,809,763.88
  5. Step 5: Solve for x
    x = 68,809,763.88/7,821
  6. Step 6: Final answer
    x = 8,798.08

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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.