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Finding the Fourth Proportional to 1,109.25, 1,663.74 and 287.46

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Solution

The fourth proportional to 1,109.25, 1,663.74 and 287.46 is: 431.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.25 : 1,663.74 = 287.46 : x
  2. Step 2: Convert to fraction form
    1,109.25/1,663.74 = 287.46/x
  3. Step 3: Cross multiply
    1,109.25x = 1,663.74 × 287.46
  4. Step 4: Simplify right side
    1,109.25x = 478,258.70
  5. Step 5: Solve for x
    x = 478,258.70/1,109.25
  6. Step 6: Final answer
    x = 431.16

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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.