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Finding the Fourth Proportional to 771.22, 1,155.61 and 424.03

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Solution

The fourth proportional to 771.22, 1,155.61 and 424.03 is: 635.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.22 : 1,155.61 = 424.03 : x
  2. Step 2: Convert to fraction form
    771.22/1,155.61 = 424.03/x
  3. Step 3: Cross multiply
    771.22x = 1,155.61 × 424.03
  4. Step 4: Simplify right side
    771.22x = 490,013.31
  5. Step 5: Solve for x
    x = 490,013.31/771.22
  6. Step 6: Final answer
    x = 635.37

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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.