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Finding the Fourth Proportional to 775.47, 1,161.90 and 620.58

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Solution

The fourth proportional to 775.47, 1,161.90 and 620.58 is: 929.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.47 : 1,161.90 = 620.58 : x
  2. Step 2: Convert to fraction form
    775.47/1,161.90 = 620.58/x
  3. Step 3: Cross multiply
    775.47x = 1,161.90 × 620.58
  4. Step 4: Simplify right side
    775.47x = 721,051.90
  5. Step 5: Solve for x
    x = 721,051.90/775.47
  6. Step 6: Final answer
    x = 929.83

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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.