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Finding the Fourth Proportional to 521.69, 782.15 and 316.21

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Solution

The fourth proportional to 521.69, 782.15 and 316.21 is: 474.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.69 : 782.15 = 316.21 : x
  2. Step 2: Convert to fraction form
    521.69/782.15 = 316.21/x
  3. Step 3: Cross multiply
    521.69x = 782.15 × 316.21
  4. Step 4: Simplify right side
    521.69x = 247,320.12
  5. Step 5: Solve for x
    x = 247,320.12/521.69
  6. Step 6: Final answer
    x = 474.08

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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.