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Finding the Fourth Proportional to 521.15, 782.94 and 448.25

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Solution

The fourth proportional to 521.15, 782.94 and 448.25 is: 673.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.15 : 782.94 = 448.25 : x
  2. Step 2: Convert to fraction form
    521.15/782.94 = 448.25/x
  3. Step 3: Cross multiply
    521.15x = 782.94 × 448.25
  4. Step 4: Simplify right side
    521.15x = 350,948.94
  5. Step 5: Solve for x
    x = 350,948.94/521.15
  6. Step 6: Final answer
    x = 673.42

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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.