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Finding the Fourth Proportional to 4,755.56, 7,128.21 and 1,981.49

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Solution

The fourth proportional to 4,755.56, 7,128.21 and 1,981.49 is: 2,970.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,755.56 : 7,128.21 = 1,981.49 : x
  2. Step 2: Convert to fraction form
    4,755.56/7,128.21 = 1,981.49/x
  3. Step 3: Cross multiply
    4,755.56x = 7,128.21 × 1,981.49
  4. Step 4: Simplify right side
    4,755.56x = 14,124,441.19
  5. Step 5: Solve for x
    x = 14,124,441.19/4,755.56
  6. Step 6: Final answer
    x = 2,970.09

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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.