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Finding the Fourth Proportional to 1,104.12, 1,523.72 and 638.64

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Solution

The fourth proportional to 1,104.12, 1,523.72 and 638.64 is: 881.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,104.12 : 1,523.72 = 638.64 : x
  2. Step 2: Convert to fraction form
    1,104.12/1,523.72 = 638.64/x
  3. Step 3: Cross multiply
    1,104.12x = 1,523.72 × 638.64
  4. Step 4: Simplify right side
    1,104.12x = 973,108.54
  5. Step 5: Solve for x
    x = 973,108.54/1,104.12
  6. Step 6: Final answer
    x = 881.34

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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.