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Finding the Fourth Proportional to 976.12, 1,462.25 and 513.21

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Solution

The fourth proportional to 976.12, 1,462.25 and 513.21 is: 768.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.12 : 1,462.25 = 513.21 : x
  2. Step 2: Convert to fraction form
    976.12/1,462.25 = 513.21/x
  3. Step 3: Cross multiply
    976.12x = 1,462.25 × 513.21
  4. Step 4: Simplify right side
    976.12x = 750,441.32
  5. Step 5: Solve for x
    x = 750,441.32/976.12
  6. Step 6: Final answer
    x = 768.80

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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.