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Finding the Fourth Proportional to 880.38, 1,321.56 and 859.59

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Solution

The fourth proportional to 880.38, 1,321.56 and 859.59 is: 1,290.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.38 : 1,321.56 = 859.59 : x
  2. Step 2: Convert to fraction form
    880.38/1,321.56 = 859.59/x
  3. Step 3: Cross multiply
    880.38x = 1,321.56 × 859.59
  4. Step 4: Simplify right side
    880.38x = 1,135,999.76
  5. Step 5: Solve for x
    x = 1,135,999.76/880.38
  6. Step 6: Final answer
    x = 1,290.35

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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.