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Finding the Fourth Proportional to 659.32, 988.67 and 385.33

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Solution

The fourth proportional to 659.32, 988.67 and 385.33 is: 577.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.32 : 988.67 = 385.33 : x
  2. Step 2: Convert to fraction form
    659.32/988.67 = 385.33/x
  3. Step 3: Cross multiply
    659.32x = 988.67 × 385.33
  4. Step 4: Simplify right side
    659.32x = 380,964.21
  5. Step 5: Solve for x
    x = 380,964.21/659.32
  6. Step 6: Final answer
    x = 577.81

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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.