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Finding the Fourth Proportional to 853.03, 1,279.53 and 690.82

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Solution

The fourth proportional to 853.03, 1,279.53 and 690.82 is: 1,036.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.03 : 1,279.53 = 690.82 : x
  2. Step 2: Convert to fraction form
    853.03/1,279.53 = 690.82/x
  3. Step 3: Cross multiply
    853.03x = 1,279.53 × 690.82
  4. Step 4: Simplify right side
    853.03x = 883,924.91
  5. Step 5: Solve for x
    x = 883,924.91/853.03
  6. Step 6: Final answer
    x = 1,036.22

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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.