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Finding the Fourth Proportional to 1,387.29, 1,914.48 and 757.82

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Solution

The fourth proportional to 1,387.29, 1,914.48 and 757.82 is: 1,045.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.29 : 1,914.48 = 757.82 : x
  2. Step 2: Convert to fraction form
    1,387.29/1,914.48 = 757.82/x
  3. Step 3: Cross multiply
    1,387.29x = 1,914.48 × 757.82
  4. Step 4: Simplify right side
    1,387.29x = 1,450,821.66
  5. Step 5: Solve for x
    x = 1,450,821.66/1,387.29
  6. Step 6: Final answer
    x = 1,045.80

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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.