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Finding the Fourth Proportional to 968.90, 1,452.11 and 420.93

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Solution

The fourth proportional to 968.90, 1,452.11 and 420.93 is: 630.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.90 : 1,452.11 = 420.93 : x
  2. Step 2: Convert to fraction form
    968.90/1,452.11 = 420.93/x
  3. Step 3: Cross multiply
    968.90x = 1,452.11 × 420.93
  4. Step 4: Simplify right side
    968.90x = 611,234.56
  5. Step 5: Solve for x
    x = 611,234.56/968.90
  6. Step 6: Final answer
    x = 630.86

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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.