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Finding the Fourth Proportional to 1,245.80, 1,717.62 and 852.20

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Solution

The fourth proportional to 1,245.80, 1,717.62 and 852.20 is: 1,174.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.80 : 1,717.62 = 852.20 : x
  2. Step 2: Convert to fraction form
    1,245.80/1,717.62 = 852.20/x
  3. Step 3: Cross multiply
    1,245.80x = 1,717.62 × 852.20
  4. Step 4: Simplify right side
    1,245.80x = 1,463,755.76
  5. Step 5: Solve for x
    x = 1,463,755.76/1,245.80
  6. Step 6: Final answer
    x = 1,174.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.