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Finding the Fourth Proportional to 854.30, 1,279.05 and 830.30

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Solution

The fourth proportional to 854.30, 1,279.05 and 830.30 is: 1,243.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.30 : 1,279.05 = 830.30 : x
  2. Step 2: Convert to fraction form
    854.30/1,279.05 = 830.30/x
  3. Step 3: Cross multiply
    854.30x = 1,279.05 × 830.30
  4. Step 4: Simplify right side
    854.30x = 1,061,995.22
  5. Step 5: Solve for x
    x = 1,061,995.22/854.30
  6. Step 6: Final answer
    x = 1,243.12

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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.