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Finding the Fourth Proportional to 832.20, 1,145.26 and 644.96

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Solution

The fourth proportional to 832.20, 1,145.26 and 644.96 is: 887.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.20 : 1,145.26 = 644.96 : x
  2. Step 2: Convert to fraction form
    832.20/1,145.26 = 644.96/x
  3. Step 3: Cross multiply
    832.20x = 1,145.26 × 644.96
  4. Step 4: Simplify right side
    832.20x = 738,646.89
  5. Step 5: Solve for x
    x = 738,646.89/832.20
  6. Step 6: Final answer
    x = 887.58

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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.