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Finding the Fourth Proportional to 1,321.06, 1,980.17 and 859.17

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Solution

The fourth proportional to 1,321.06, 1,980.17 and 859.17 is: 1,287.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.06 : 1,980.17 = 859.17 : x
  2. Step 2: Convert to fraction form
    1,321.06/1,980.17 = 859.17/x
  3. Step 3: Cross multiply
    1,321.06x = 1,980.17 × 859.17
  4. Step 4: Simplify right side
    1,321.06x = 1,701,302.66
  5. Step 5: Solve for x
    x = 1,701,302.66/1,321.06
  6. Step 6: Final answer
    x = 1,287.83

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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.