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Finding the Fourth Proportional to 998.24, 1,378.24 and 625.36

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Solution

The fourth proportional to 998.24, 1,378.24 and 625.36 is: 863.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.24 : 1,378.24 = 625.36 : x
  2. Step 2: Convert to fraction form
    998.24/1,378.24 = 625.36/x
  3. Step 3: Cross multiply
    998.24x = 1,378.24 × 625.36
  4. Step 4: Simplify right side
    998.24x = 861,896.17
  5. Step 5: Solve for x
    x = 861,896.17/998.24
  6. Step 6: Final answer
    x = 863.42

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1.5x scale

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.