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Finding the Fourth Proportional to 521.50, 782.23 and 156.31

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Solution

The fourth proportional to 521.50, 782.23 and 156.31 is: 234.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.50 : 782.23 = 156.31 : x
  2. Step 2: Convert to fraction form
    521.50/782.23 = 156.31/x
  3. Step 3: Cross multiply
    521.50x = 782.23 × 156.31
  4. Step 4: Simplify right side
    521.50x = 122,270.37
  5. Step 5: Solve for x
    x = 122,270.37/521.50
  6. Step 6: Final answer
    x = 234.46

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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.