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Finding the Fourth Proportional to 1,308.39, 1,805.64 and 865.53

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Solution

The fourth proportional to 1,308.39, 1,805.64 and 865.53 is: 1,194.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.39 : 1,805.64 = 865.53 : x
  2. Step 2: Convert to fraction form
    1,308.39/1,805.64 = 865.53/x
  3. Step 3: Cross multiply
    1,308.39x = 1,805.64 × 865.53
  4. Step 4: Simplify right side
    1,308.39x = 1,562,835.59
  5. Step 5: Solve for x
    x = 1,562,835.59/1,308.39
  6. Step 6: Final answer
    x = 1,194.47

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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.