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Finding the Fourth Proportional to 998.28, 1,496.88 and 421.04

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Solution

The fourth proportional to 998.28, 1,496.88 and 421.04 is: 631.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.28 : 1,496.88 = 421.04 : x
  2. Step 2: Convert to fraction form
    998.28/1,496.88 = 421.04/x
  3. Step 3: Cross multiply
    998.28x = 1,496.88 × 421.04
  4. Step 4: Simplify right side
    998.28x = 630,246.36
  5. Step 5: Solve for x
    x = 630,246.36/998.28
  6. Step 6: Final answer
    x = 631.33

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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.