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Finding the Fourth Proportional to 1,102.23, 1,520.15 and 853.11

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Solution

The fourth proportional to 1,102.23, 1,520.15 and 853.11 is: 1,176.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.23 : 1,520.15 = 853.11 : x
  2. Step 2: Convert to fraction form
    1,102.23/1,520.15 = 853.11/x
  3. Step 3: Cross multiply
    1,102.23x = 1,520.15 × 853.11
  4. Step 4: Simplify right side
    1,102.23x = 1,296,850.90
  5. Step 5: Solve for x
    x = 1,296,850.90/1,102.23
  6. Step 6: Final answer
    x = 1,176.57

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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.