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Finding the Fourth Proportional to 854.12, 1,279.56 and 606.80

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Solution

The fourth proportional to 854.12, 1,279.56 and 606.80 is: 909.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.12 : 1,279.56 = 606.80 : x
  2. Step 2: Convert to fraction form
    854.12/1,279.56 = 606.80/x
  3. Step 3: Cross multiply
    854.12x = 1,279.56 × 606.80
  4. Step 4: Simplify right side
    854.12x = 776,437.01
  5. Step 5: Solve for x
    x = 776,437.01/854.12
  6. Step 6: Final answer
    x = 909.05

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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.