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Finding the Fourth Proportional to 853.70, 1,274.13 and 751.30

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Solution

The fourth proportional to 853.70, 1,274.13 and 751.30 is: 1,121.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.70 : 1,274.13 = 751.30 : x
  2. Step 2: Convert to fraction form
    853.70/1,274.13 = 751.30/x
  3. Step 3: Cross multiply
    853.70x = 1,274.13 × 751.30
  4. Step 4: Simplify right side
    853.70x = 957,253.87
  5. Step 5: Solve for x
    x = 957,253.87/853.70
  6. Step 6: Final answer
    x = 1,121.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.