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Finding the Fourth Proportional to 1,115.27, 1,539.09 and 673.07

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Solution

The fourth proportional to 1,115.27, 1,539.09 and 673.07 is: 928.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.27 : 1,539.09 = 673.07 : x
  2. Step 2: Convert to fraction form
    1,115.27/1,539.09 = 673.07/x
  3. Step 3: Cross multiply
    1,115.27x = 1,539.09 × 673.07
  4. Step 4: Simplify right side
    1,115.27x = 1,035,911.94
  5. Step 5: Solve for x
    x = 1,035,911.94/1,115.27
  6. Step 6: Final answer
    x = 928.85

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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.