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Finding the Fourth Proportional to 1,605.56, 2,405.77 and 865.15

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Solution

The fourth proportional to 1,605.56, 2,405.77 and 865.15 is: 1,296.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.56 : 2,405.77 = 865.15 : x
  2. Step 2: Convert to fraction form
    1,605.56/2,405.77 = 865.15/x
  3. Step 3: Cross multiply
    1,605.56x = 2,405.77 × 865.15
  4. Step 4: Simplify right side
    1,605.56x = 2,081,343.74
  5. Step 5: Solve for x
    x = 2,081,343.74/1,605.56
  6. Step 6: Final answer
    x = 1,296.34

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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.