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Finding the Fourth Proportional to 976.46, 1,345.36 and 644.30

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Solution

The fourth proportional to 976.46, 1,345.36 and 644.30 is: 887.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.46 : 1,345.36 = 644.30 : x
  2. Step 2: Convert to fraction form
    976.46/1,345.36 = 644.30/x
  3. Step 3: Cross multiply
    976.46x = 1,345.36 × 644.30
  4. Step 4: Simplify right side
    976.46x = 866,815.45
  5. Step 5: Solve for x
    x = 866,815.45/976.46
  6. Step 6: Final answer
    x = 887.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.