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Finding the Fourth Proportional to 998.01, 1,496.75 and 420.75

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Solution

The fourth proportional to 998.01, 1,496.75 and 420.75 is: 631.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.01 : 1,496.75 = 420.75 : x
  2. Step 2: Convert to fraction form
    998.01/1,496.75 = 420.75/x
  3. Step 3: Cross multiply
    998.01x = 1,496.75 × 420.75
  4. Step 4: Simplify right side
    998.01x = 629,755.46
  5. Step 5: Solve for x
    x = 629,755.46/998.01
  6. Step 6: Final answer
    x = 631.01

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Double scale
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1.5x scale

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.