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Finding the Fourth Proportional to 521.78, 722.13 and 448.34

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Solution

The fourth proportional to 521.78, 722.13 and 448.34 is: 620.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.78 : 722.13 = 448.34 : x
  2. Step 2: Convert to fraction form
    521.78/722.13 = 448.34/x
  3. Step 3: Cross multiply
    521.78x = 722.13 × 448.34
  4. Step 4: Simplify right side
    521.78x = 323,759.76
  5. Step 5: Solve for x
    x = 323,759.76/521.78
  6. Step 6: Final answer
    x = 620.49

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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.