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Finding the Fourth Proportional to 3,213.77, 4,821.35 and 992.61

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Solution

The fourth proportional to 3,213.77, 4,821.35 and 992.61 is: 1,489.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,213.77 : 4,821.35 = 992.61 : x
  2. Step 2: Convert to fraction form
    3,213.77/4,821.35 = 992.61/x
  3. Step 3: Cross multiply
    3,213.77x = 4,821.35 × 992.61
  4. Step 4: Simplify right side
    3,213.77x = 4,785,715.26
  5. Step 5: Solve for x
    x = 4,785,715.26/3,213.77
  6. Step 6: Final answer
    x = 1,489.13

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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.