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Finding the Fourth Proportional to 1,115.44, 1,673.49 and 385.09

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Solution

The fourth proportional to 1,115.44, 1,673.49 and 385.09 is: 577.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.44 : 1,673.49 = 385.09 : x
  2. Step 2: Convert to fraction form
    1,115.44/1,673.49 = 385.09/x
  3. Step 3: Cross multiply
    1,115.44x = 1,673.49 × 385.09
  4. Step 4: Simplify right side
    1,115.44x = 644,444.26
  5. Step 5: Solve for x
    x = 644,444.26/1,115.44
  6. Step 6: Final answer
    x = 577.75

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.