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Finding the Fourth Proportional to 997.76, 1,496.96 and 420.64

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Solution

The fourth proportional to 997.76, 1,496.96 and 420.64 is: 631.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.76 : 1,496.96 = 420.64 : x
  2. Step 2: Convert to fraction form
    997.76/1,496.96 = 420.64/x
  3. Step 3: Cross multiply
    997.76x = 1,496.96 × 420.64
  4. Step 4: Simplify right side
    997.76x = 629,681.25
  5. Step 5: Solve for x
    x = 629,681.25/997.76
  6. Step 6: Final answer
    x = 631.09

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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.