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Finding the Fourth Proportional to 553.58, 765.79 and 521.29

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Solution

The fourth proportional to 553.58, 765.79 and 521.29 is: 721.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.58 : 765.79 = 521.29 : x
  2. Step 2: Convert to fraction form
    553.58/765.79 = 521.29/x
  3. Step 3: Cross multiply
    553.58x = 765.79 × 521.29
  4. Step 4: Simplify right side
    553.58x = 399,201.06
  5. Step 5: Solve for x
    x = 399,201.06/553.58
  6. Step 6: Final answer
    x = 721.12

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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.