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Finding the Fourth Proportional to 842.90, 1,163.78 and 528.29

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Solution

The fourth proportional to 842.90, 1,163.78 and 528.29 is: 729.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.90 : 1,163.78 = 528.29 : x
  2. Step 2: Convert to fraction form
    842.90/1,163.78 = 528.29/x
  3. Step 3: Cross multiply
    842.90x = 1,163.78 × 528.29
  4. Step 4: Simplify right side
    842.90x = 614,804.88
  5. Step 5: Solve for x
    x = 614,804.88/842.90
  6. Step 6: Final answer
    x = 729.40

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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.