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Finding the Fourth Proportional to 1,115.67, 1,673.80 and 385.30

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Solution

The fourth proportional to 1,115.67, 1,673.80 and 385.30 is: 578.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.67 : 1,673.80 = 385.30 : x
  2. Step 2: Convert to fraction form
    1,115.67/1,673.80 = 385.30/x
  3. Step 3: Cross multiply
    1,115.67x = 1,673.80 × 385.30
  4. Step 4: Simplify right side
    1,115.67x = 644,915.14
  5. Step 5: Solve for x
    x = 644,915.14/1,115.67
  6. Step 6: Final answer
    x = 578.05

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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.