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Finding the Fourth Proportional to 654.82, 981.91 and 380.99

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Solution

The fourth proportional to 654.82, 981.91 and 380.99 is: 571.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.82 : 981.91 = 380.99 : x
  2. Step 2: Convert to fraction form
    654.82/981.91 = 380.99/x
  3. Step 3: Cross multiply
    654.82x = 981.91 × 380.99
  4. Step 4: Simplify right side
    654.82x = 374,095.99
  5. Step 5: Solve for x
    x = 374,095.99/654.82
  6. Step 6: Final answer
    x = 571.30

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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.