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Finding the Fourth Proportional to 853.34, 1,280.17 and 305.51

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Solution

The fourth proportional to 853.34, 1,280.17 and 305.51 is: 458.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.34 : 1,280.17 = 305.51 : x
  2. Step 2: Convert to fraction form
    853.34/1,280.17 = 305.51/x
  3. Step 3: Cross multiply
    853.34x = 1,280.17 × 305.51
  4. Step 4: Simplify right side
    853.34x = 391,098.72
  5. Step 5: Solve for x
    x = 391,098.72/853.34
  6. Step 6: Final answer
    x = 458.32

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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.