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Finding the Fourth Proportional to 1,018.22, 1,405.25 and 625.01

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Solution

The fourth proportional to 1,018.22, 1,405.25 and 625.01 is: 862.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.22 : 1,405.25 = 625.01 : x
  2. Step 2: Convert to fraction form
    1,018.22/1,405.25 = 625.01/x
  3. Step 3: Cross multiply
    1,018.22x = 1,405.25 × 625.01
  4. Step 4: Simplify right side
    1,018.22x = 878,289.84
  5. Step 5: Solve for x
    x = 878,289.84/1,018.22
  6. Step 6: Final answer
    x = 862.58

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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.