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Finding the Fourth Proportional to 879.94, 1,317.66 and 620.20

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Solution

The fourth proportional to 879.94, 1,317.66 and 620.20 is: 928.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.94 : 1,317.66 = 620.20 : x
  2. Step 2: Convert to fraction form
    879.94/1,317.66 = 620.20/x
  3. Step 3: Cross multiply
    879.94x = 1,317.66 × 620.20
  4. Step 4: Simplify right side
    879.94x = 817,212.73
  5. Step 5: Solve for x
    x = 817,212.73/879.94
  6. Step 6: Final answer
    x = 928.71

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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.