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Finding the Fourth Proportional to 853.14, 1,279.38 and 305.28

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Solution

The fourth proportional to 853.14, 1,279.38 and 305.28 is: 457.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.14 : 1,279.38 = 305.28 : x
  2. Step 2: Convert to fraction form
    853.14/1,279.38 = 305.28/x
  3. Step 3: Cross multiply
    853.14x = 1,279.38 × 305.28
  4. Step 4: Simplify right side
    853.14x = 390,569.13
  5. Step 5: Solve for x
    x = 390,569.13/853.14
  6. Step 6: Final answer
    x = 457.80

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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.