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Finding the Fourth Proportional to 826.02, 1,239.30 and 644.04

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Solution

The fourth proportional to 826.02, 1,239.30 and 644.04 is: 966.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.02 : 1,239.30 = 644.04 : x
  2. Step 2: Convert to fraction form
    826.02/1,239.30 = 644.04/x
  3. Step 3: Cross multiply
    826.02x = 1,239.30 × 644.04
  4. Step 4: Simplify right side
    826.02x = 798,158.77
  5. Step 5: Solve for x
    x = 798,158.77/826.02
  6. Step 6: Final answer
    x = 966.27

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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.