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Finding the Fourth Proportional to 1,015.44, 1,399.92 and 642.23

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Solution

The fourth proportional to 1,015.44, 1,399.92 and 642.23 is: 885.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.44 : 1,399.92 = 642.23 : x
  2. Step 2: Convert to fraction form
    1,015.44/1,399.92 = 642.23/x
  3. Step 3: Cross multiply
    1,015.44x = 1,399.92 × 642.23
  4. Step 4: Simplify right side
    1,015.44x = 899,070.62
  5. Step 5: Solve for x
    x = 899,070.62/1,015.44
  6. Step 6: Final answer
    x = 885.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.