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Finding the Fourth Proportional to 1,272, 1,755.78 and 853.08

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Solution

The fourth proportional to 1,272, 1,755.78 and 853.08 is: 1,177.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272 : 1,755.78 = 853.08 : x
  2. Step 2: Convert to fraction form
    1,272/1,755.78 = 853.08/x
  3. Step 3: Cross multiply
    1,272x = 1,755.78 × 853.08
  4. Step 4: Simplify right side
    1,272x = 1,497,820.80
  5. Step 5: Solve for x
    x = 1,497,820.80/1,272
  6. Step 6: Final answer
    x = 1,177.53

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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.