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Finding the Fourth Proportional to 1,077.86, 1,487.43 and 679.44

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Solution

The fourth proportional to 1,077.86, 1,487.43 and 679.44 is: 937.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.86 : 1,487.43 = 679.44 : x
  2. Step 2: Convert to fraction form
    1,077.86/1,487.43 = 679.44/x
  3. Step 3: Cross multiply
    1,077.86x = 1,487.43 × 679.44
  4. Step 4: Simplify right side
    1,077.86x = 1,010,625.02
  5. Step 5: Solve for x
    x = 1,010,625.02/1,077.86
  6. Step 6: Final answer
    x = 937.62

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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.