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Finding the Fourth Proportional to 5,411.84, 8,120.16 and 2,123.84

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Solution

The fourth proportional to 5,411.84, 8,120.16 and 2,123.84 is: 3,186.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,411.84 : 8,120.16 = 2,123.84 : x
  2. Step 2: Convert to fraction form
    5,411.84/8,120.16 = 2,123.84/x
  3. Step 3: Cross multiply
    5,411.84x = 8,120.16 × 2,123.84
  4. Step 4: Simplify right side
    5,411.84x = 17,245,920.61
  5. Step 5: Solve for x
    x = 17,245,920.61/5,411.84
  6. Step 6: Final answer
    x = 3,186.70

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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.