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Finding the Fourth Proportional to 853, 1,279.50 and 245

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Solution

The fourth proportional to 853, 1,279.50 and 245 is: 367.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    853 : 1,279.50 = 245 : x
  2. Step 2: Convert to fraction form
    853/1,279.50 = 245/x
  3. Step 3: Cross multiply
    853x = 1,279.50 × 245
  4. Step 4: Simplify right side
    853x = 313,477.50
  5. Step 5: Solve for x
    x = 313,477.50/853
  6. Step 6: Final answer
    x = 367.50

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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.