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Finding the Fourth Proportional to 976.62, 1,464.34 and 391.72

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Solution

The fourth proportional to 976.62, 1,464.34 and 391.72 is: 587.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.62 : 1,464.34 = 391.72 : x
  2. Step 2: Convert to fraction form
    976.62/1,464.34 = 391.72/x
  3. Step 3: Cross multiply
    976.62x = 1,464.34 × 391.72
  4. Step 4: Simplify right side
    976.62x = 573,611.26
  5. Step 5: Solve for x
    x = 573,611.26/976.62
  6. Step 6: Final answer
    x = 587.34

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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.