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Finding the Fourth Proportional to 654.43, 981.77 and 215.71

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Solution

The fourth proportional to 654.43, 981.77 and 215.71 is: 323.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.43 : 981.77 = 215.71 : x
  2. Step 2: Convert to fraction form
    654.43/981.77 = 215.71/x
  3. Step 3: Cross multiply
    654.43x = 981.77 × 215.71
  4. Step 4: Simplify right side
    654.43x = 211,777.07
  5. Step 5: Solve for x
    x = 211,777.07/654.43
  6. Step 6: Final answer
    x = 323.60

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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.