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Finding the Fourth Proportional to 1,018.36, 1,405.24 and 625.44

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Solution

The fourth proportional to 1,018.36, 1,405.24 and 625.44 is: 863.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.36 : 1,405.24 = 625.44 : x
  2. Step 2: Convert to fraction form
    1,018.36/1,405.24 = 625.44/x
  3. Step 3: Cross multiply
    1,018.36x = 1,405.24 × 625.44
  4. Step 4: Simplify right side
    1,018.36x = 878,893.31
  5. Step 5: Solve for x
    x = 878,893.31/1,018.36
  6. Step 6: Final answer
    x = 863.05

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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.