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Finding the Fourth Proportional to 997.24, 1,495.80 and 420.16

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Solution

The fourth proportional to 997.24, 1,495.80 and 420.16 is: 630.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.24 : 1,495.80 = 420.16 : x
  2. Step 2: Convert to fraction form
    997.24/1,495.80 = 420.16/x
  3. Step 3: Cross multiply
    997.24x = 1,495.80 × 420.16
  4. Step 4: Simplify right side
    997.24x = 628,475.33
  5. Step 5: Solve for x
    x = 628,475.33/997.24
  6. Step 6: Final answer
    x = 630.21

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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.