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Finding the Fourth Proportional to 679.39, 931.55 and 662.99

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Solution

The fourth proportional to 679.39, 931.55 and 662.99 is: 909.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.39 : 931.55 = 662.99 : x
  2. Step 2: Convert to fraction form
    679.39/931.55 = 662.99/x
  3. Step 3: Cross multiply
    679.39x = 931.55 × 662.99
  4. Step 4: Simplify right side
    679.39x = 617,604.09
  5. Step 5: Solve for x
    x = 617,604.09/679.39
  6. Step 6: Final answer
    x = 909.06

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.