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Finding the Fourth Proportional to 1,308.54, 1,805.43 and 777.29

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Solution

The fourth proportional to 1,308.54, 1,805.43 and 777.29 is: 1,072.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.54 : 1,805.43 = 777.29 : x
  2. Step 2: Convert to fraction form
    1,308.54/1,805.43 = 777.29/x
  3. Step 3: Cross multiply
    1,308.54x = 1,805.43 × 777.29
  4. Step 4: Simplify right side
    1,308.54x = 1,403,333.66
  5. Step 5: Solve for x
    x = 1,403,333.66/1,308.54
  6. Step 6: Final answer
    x = 1,072.44

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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.