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Finding the Fourth Proportional to 879.27, 1,212.95 and 642.83

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Solution

The fourth proportional to 879.27, 1,212.95 and 642.83 is: 886.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.27 : 1,212.95 = 642.83 : x
  2. Step 2: Convert to fraction form
    879.27/1,212.95 = 642.83/x
  3. Step 3: Cross multiply
    879.27x = 1,212.95 × 642.83
  4. Step 4: Simplify right side
    879.27x = 779,711.37
  5. Step 5: Solve for x
    x = 779,711.37/879.27
  6. Step 6: Final answer
    x = 886.77

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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.