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Finding the Fourth Proportional to 659.79, 987.86 and 333.56

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Solution

The fourth proportional to 659.79, 987.86 and 333.56 is: 499.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.79 : 987.86 = 333.56 : x
  2. Step 2: Convert to fraction form
    659.79/987.86 = 333.56/x
  3. Step 3: Cross multiply
    659.79x = 987.86 × 333.56
  4. Step 4: Simplify right side
    659.79x = 329,510.58
  5. Step 5: Solve for x
    x = 329,510.58/659.79
  6. Step 6: Final answer
    x = 499.42

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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.