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Finding the Fourth Proportional to 1,018.56, 1,405.28 and 625.44

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Solution

The fourth proportional to 1,018.56, 1,405.28 and 625.44 is: 862.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.56 : 1,405.28 = 625.44 : x
  2. Step 2: Convert to fraction form
    1,018.56/1,405.28 = 625.44/x
  3. Step 3: Cross multiply
    1,018.56x = 1,405.28 × 625.44
  4. Step 4: Simplify right side
    1,018.56x = 878,918.32
  5. Step 5: Solve for x
    x = 878,918.32/1,018.56
  6. Step 6: Final answer
    x = 862.90

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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.