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Finding the Fourth Proportional to 1,115.87, 1,673.33 and 422.40

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Solution

The fourth proportional to 1,115.87, 1,673.33 and 422.40 is: 633.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.87 : 1,673.33 = 422.40 : x
  2. Step 2: Convert to fraction form
    1,115.87/1,673.33 = 422.40/x
  3. Step 3: Cross multiply
    1,115.87x = 1,673.33 × 422.40
  4. Step 4: Simplify right side
    1,115.87x = 706,812.48
  5. Step 5: Solve for x
    x = 706,812.48/1,115.87
  6. Step 6: Final answer
    x = 633.42

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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.