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Finding the Fourth Proportional to 521.45, 782.17 and 156.24

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Solution

The fourth proportional to 521.45, 782.17 and 156.24 is: 234.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.45 : 782.17 = 156.24 : x
  2. Step 2: Convert to fraction form
    521.45/782.17 = 156.24/x
  3. Step 3: Cross multiply
    521.45x = 782.17 × 156.24
  4. Step 4: Simplify right side
    521.45x = 122,206.24
  5. Step 5: Solve for x
    x = 122,206.24/521.45
  6. Step 6: Final answer
    x = 234.36

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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.