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Finding the Fourth Proportional to 659.25, 988.88 and 399.88

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Solution

The fourth proportional to 659.25, 988.88 and 399.88 is: 599.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.25 : 988.88 = 399.88 : x
  2. Step 2: Convert to fraction form
    659.25/988.88 = 399.88/x
  3. Step 3: Cross multiply
    659.25x = 988.88 × 399.88
  4. Step 4: Simplify right side
    659.25x = 395,433.33
  5. Step 5: Solve for x
    x = 395,433.33/659.25
  6. Step 6: Final answer
    x = 599.82

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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.