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Finding the Fourth Proportional to 659.75, 990.03 and 371.39

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Solution

The fourth proportional to 659.75, 990.03 and 371.39 is: 557.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.75 : 990.03 = 371.39 : x
  2. Step 2: Convert to fraction form
    659.75/990.03 = 371.39/x
  3. Step 3: Cross multiply
    659.75x = 990.03 × 371.39
  4. Step 4: Simplify right side
    659.75x = 367,682.29
  5. Step 5: Solve for x
    x = 367,682.29/659.75
  6. Step 6: Final answer
    x = 557.31

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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.