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Finding the Fourth Proportional to 659.18, 987.35 and 311.99

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Solution

The fourth proportional to 659.18, 987.35 and 311.99 is: 467.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.18 : 987.35 = 311.99 : x
  2. Step 2: Convert to fraction form
    659.18/987.35 = 311.99/x
  3. Step 3: Cross multiply
    659.18x = 987.35 × 311.99
  4. Step 4: Simplify right side
    659.18x = 308,043.33
  5. Step 5: Solve for x
    x = 308,043.33/659.18
  6. Step 6: Final answer
    x = 467.31

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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.