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Finding the Fourth Proportional to 1,115.70, 1,673.12 and 385.08

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Solution

The fourth proportional to 1,115.70, 1,673.12 and 385.08 is: 577.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.70 : 1,673.12 = 385.08 : x
  2. Step 2: Convert to fraction form
    1,115.70/1,673.12 = 385.08/x
  3. Step 3: Cross multiply
    1,115.70x = 1,673.12 × 385.08
  4. Step 4: Simplify right side
    1,115.70x = 644,285.05
  5. Step 5: Solve for x
    x = 644,285.05/1,115.70
  6. Step 6: Final answer
    x = 577.47

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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.