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Finding the Fourth Proportional to 655.19, 982.99 and 380.70

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Solution

The fourth proportional to 655.19, 982.99 and 380.70 is: 571.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.19 : 982.99 = 380.70 : x
  2. Step 2: Convert to fraction form
    655.19/982.99 = 380.70/x
  3. Step 3: Cross multiply
    655.19x = 982.99 × 380.70
  4. Step 4: Simplify right side
    655.19x = 374,222.63
  5. Step 5: Solve for x
    x = 374,222.63/655.19
  6. Step 6: Final answer
    x = 571.17

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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.