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Finding the Fourth Proportional to 1,115.53, 1,538.63 and 905.69

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Solution

The fourth proportional to 1,115.53, 1,538.63 and 905.69 is: 1,249.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.53 : 1,538.63 = 905.69 : x
  2. Step 2: Convert to fraction form
    1,115.53/1,538.63 = 905.69/x
  3. Step 3: Cross multiply
    1,115.53x = 1,538.63 × 905.69
  4. Step 4: Simplify right side
    1,115.53x = 1,393,521.80
  5. Step 5: Solve for x
    x = 1,393,521.80/1,115.53
  6. Step 6: Final answer
    x = 1,249.20

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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.