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Finding the Fourth Proportional to 879.47, 1,315.96 and 620.11

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Solution

The fourth proportional to 879.47, 1,315.96 and 620.11 is: 927.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.47 : 1,315.96 = 620.11 : x
  2. Step 2: Convert to fraction form
    879.47/1,315.96 = 620.11/x
  3. Step 3: Cross multiply
    879.47x = 1,315.96 × 620.11
  4. Step 4: Simplify right side
    879.47x = 816,033.52
  5. Step 5: Solve for x
    x = 816,033.52/879.47
  6. Step 6: Final answer
    x = 927.87

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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.