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Finding the Fourth Proportional to 853.46, 1,279.33 and 305.35

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Solution

The fourth proportional to 853.46, 1,279.33 and 305.35 is: 457.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.46 : 1,279.33 = 305.35 : x
  2. Step 2: Convert to fraction form
    853.46/1,279.33 = 305.35/x
  3. Step 3: Cross multiply
    853.46x = 1,279.33 × 305.35
  4. Step 4: Simplify right side
    853.46x = 390,639.45
  5. Step 5: Solve for x
    x = 390,639.45/853.46
  6. Step 6: Final answer
    x = 457.71

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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.