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Finding the Fourth Proportional to 879.11, 1,212.65 and 730.46

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Solution

The fourth proportional to 879.11, 1,212.65 and 730.46 is: 1,007.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.11 : 1,212.65 = 730.46 : x
  2. Step 2: Convert to fraction form
    879.11/1,212.65 = 730.46/x
  3. Step 3: Cross multiply
    879.11x = 1,212.65 × 730.46
  4. Step 4: Simplify right side
    879.11x = 885,782.60
  5. Step 5: Solve for x
    x = 885,782.60/879.11
  6. Step 6: Final answer
    x = 1,007.60

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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.