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Finding the Fourth Proportional to 659.92, 988.38 and 385.60

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Solution

The fourth proportional to 659.92, 988.38 and 385.60 is: 577.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.92 : 988.38 = 385.60 : x
  2. Step 2: Convert to fraction form
    659.92/988.38 = 385.60/x
  3. Step 3: Cross multiply
    659.92x = 988.38 × 385.60
  4. Step 4: Simplify right side
    659.92x = 381,119.33
  5. Step 5: Solve for x
    x = 381,119.33/659.92
  6. Step 6: Final answer
    x = 577.52

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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.