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Finding the Fourth Proportional to 1,115.12, 1,538.93 and 673.09

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Solution

The fourth proportional to 1,115.12, 1,538.93 and 673.09 is: 928.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.12 : 1,538.93 = 673.09 : x
  2. Step 2: Convert to fraction form
    1,115.12/1,538.93 = 673.09/x
  3. Step 3: Cross multiply
    1,115.12x = 1,538.93 × 673.09
  4. Step 4: Simplify right side
    1,115.12x = 1,035,838.39
  5. Step 5: Solve for x
    x = 1,035,838.39/1,115.12
  6. Step 6: Final answer
    x = 928.90

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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.