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Finding the Fourth Proportional to 708.21, 1,066.50 and 617.96

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Solution

The fourth proportional to 708.21, 1,066.50 and 617.96 is: 930.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.21 : 1,066.50 = 617.96 : x
  2. Step 2: Convert to fraction form
    708.21/1,066.50 = 617.96/x
  3. Step 3: Cross multiply
    708.21x = 1,066.50 × 617.96
  4. Step 4: Simplify right side
    708.21x = 659,057.01
  5. Step 5: Solve for x
    x = 659,057.01/708.21
  6. Step 6: Final answer
    x = 930.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.