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Finding the Fourth Proportional to 879.36, 1,210.56 and 806.40

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Solution

The fourth proportional to 879.36, 1,210.56 and 806.40 is: 1,110.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.36 : 1,210.56 = 806.40 : x
  2. Step 2: Convert to fraction form
    879.36/1,210.56 = 806.40/x
  3. Step 3: Cross multiply
    879.36x = 1,210.56 × 806.40
  4. Step 4: Simplify right side
    879.36x = 976,195.58
  5. Step 5: Solve for x
    x = 976,195.58/879.36
  6. Step 6: Final answer
    x = 1,110.12

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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.