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Finding the Fourth Proportional to 1,018.11, 1,405.26 and 625.47

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Solution

The fourth proportional to 1,018.11, 1,405.26 and 625.47 is: 863.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.11 : 1,405.26 = 625.47 : x
  2. Step 2: Convert to fraction form
    1,018.11/1,405.26 = 625.47/x
  3. Step 3: Cross multiply
    1,018.11x = 1,405.26 × 625.47
  4. Step 4: Simplify right side
    1,018.11x = 878,947.97
  5. Step 5: Solve for x
    x = 878,947.97/1,018.11
  6. Step 6: Final answer
    x = 863.31

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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.