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Finding the Fourth Proportional to 1,100.02, 1,518.21 and 628

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Solution

The fourth proportional to 1,100.02, 1,518.21 and 628 is: 866.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,100.02 : 1,518.21 = 628 : x
  2. Step 2: Convert to fraction form
    1,100.02/1,518.21 = 628/x
  3. Step 3: Cross multiply
    1,100.02x = 1,518.21 × 628
  4. Step 4: Simplify right side
    1,100.02x = 953,435.88
  5. Step 5: Solve for x
    x = 953,435.88/1,100.02
  6. Step 6: Final answer
    x = 866.74

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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.