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Finding the Fourth Proportional to 968.21, 1,451.44 and 621.65

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Solution

The fourth proportional to 968.21, 1,451.44 and 621.65 is: 931.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.21 : 1,451.44 = 621.65 : x
  2. Step 2: Convert to fraction form
    968.21/1,451.44 = 621.65/x
  3. Step 3: Cross multiply
    968.21x = 1,451.44 × 621.65
  4. Step 4: Simplify right side
    968.21x = 902,281.20
  5. Step 5: Solve for x
    x = 902,281.20/968.21
  6. Step 6: Final answer
    x = 931.90

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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.