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Finding the Fourth Proportional to 1,215.69, 1,678.37 and 773.97

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Solution

The fourth proportional to 1,215.69, 1,678.37 and 773.97 is: 1,068.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.69 : 1,678.37 = 773.97 : x
  2. Step 2: Convert to fraction form
    1,215.69/1,678.37 = 773.97/x
  3. Step 3: Cross multiply
    1,215.69x = 1,678.37 × 773.97
  4. Step 4: Simplify right side
    1,215.69x = 1,299,004.16
  5. Step 5: Solve for x
    x = 1,299,004.16/1,215.69
  6. Step 6: Final answer
    x = 1,068.53

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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.