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Finding the Fourth Proportional to 1,115.72, 1,673.72 and 385.12

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Solution

The fourth proportional to 1,115.72, 1,673.72 and 385.12 is: 577.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.72 : 1,673.72 = 385.12 : x
  2. Step 2: Convert to fraction form
    1,115.72/1,673.72 = 385.12/x
  3. Step 3: Cross multiply
    1,115.72x = 1,673.72 × 385.12
  4. Step 4: Simplify right side
    1,115.72x = 644,583.05
  5. Step 5: Solve for x
    x = 644,583.05/1,115.72
  6. Step 6: Final answer
    x = 577.73

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Half scale
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Double scale
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Similar ratio
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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.