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Finding the Fourth Proportional to 853.49, 1,280.52 and 305.83

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Solution

The fourth proportional to 853.49, 1,280.52 and 305.83 is: 458.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.49 : 1,280.52 = 305.83 : x
  2. Step 2: Convert to fraction form
    853.49/1,280.52 = 305.83/x
  3. Step 3: Cross multiply
    853.49x = 1,280.52 × 305.83
  4. Step 4: Simplify right side
    853.49x = 391,621.43
  5. Step 5: Solve for x
    x = 391,621.43/853.49
  6. Step 6: Final answer
    x = 458.85

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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.