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Finding the Fourth Proportional to 679.13, 936.90 and 521.48

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Solution

The fourth proportional to 679.13, 936.90 and 521.48 is: 719.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.13 : 936.90 = 521.48 : x
  2. Step 2: Convert to fraction form
    679.13/936.90 = 521.48/x
  3. Step 3: Cross multiply
    679.13x = 936.90 × 521.48
  4. Step 4: Simplify right side
    679.13x = 488,576.95
  5. Step 5: Solve for x
    x = 488,576.95/679.13
  6. Step 6: Final answer
    x = 719.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.