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Finding the Fourth Proportional to 1,109.05, 1,663.62 and 415.53

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Solution

The fourth proportional to 1,109.05, 1,663.62 and 415.53 is: 623.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.05 : 1,663.62 = 415.53 : x
  2. Step 2: Convert to fraction form
    1,109.05/1,663.62 = 415.53/x
  3. Step 3: Cross multiply
    1,109.05x = 1,663.62 × 415.53
  4. Step 4: Simplify right side
    1,109.05x = 691,284.02
  5. Step 5: Solve for x
    x = 691,284.02/1,109.05
  6. Step 6: Final answer
    x = 623.31

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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.