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Finding the Fourth Proportional to 1,175.16, 1,620.48 and 820.44

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Solution

The fourth proportional to 1,175.16, 1,620.48 and 820.44 is: 1,131.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.16 : 1,620.48 = 820.44 : x
  2. Step 2: Convert to fraction form
    1,175.16/1,620.48 = 820.44/x
  3. Step 3: Cross multiply
    1,175.16x = 1,620.48 × 820.44
  4. Step 4: Simplify right side
    1,175.16x = 1,329,506.61
  5. Step 5: Solve for x
    x = 1,329,506.61/1,175.16
  6. Step 6: Final answer
    x = 1,131.34

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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.