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Finding the Fourth Proportional to 1,100.20, 1,651.60 and 638.30

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Solution

The fourth proportional to 1,100.20, 1,651.60 and 638.30 is: 958.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,100.20 : 1,651.60 = 638.30 : x
  2. Step 2: Convert to fraction form
    1,100.20/1,651.60 = 638.30/x
  3. Step 3: Cross multiply
    1,100.20x = 1,651.60 × 638.30
  4. Step 4: Simplify right side
    1,100.20x = 1,054,216.28
  5. Step 5: Solve for x
    x = 1,054,216.28/1,100.20
  6. Step 6: Final answer
    x = 958.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.