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Finding the Fourth Proportional to 1,115.37, 1,539.41 and 914.90

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Solution

The fourth proportional to 1,115.37, 1,539.41 and 914.90 is: 1,262.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.37 : 1,539.41 = 914.90 : x
  2. Step 2: Convert to fraction form
    1,115.37/1,539.41 = 914.90/x
  3. Step 3: Cross multiply
    1,115.37x = 1,539.41 × 914.90
  4. Step 4: Simplify right side
    1,115.37x = 1,408,393.94
  5. Step 5: Solve for x
    x = 1,408,393.94/1,115.37
  6. Step 6: Final answer
    x = 1,262.71

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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.