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Finding the Fourth Proportional to 654.27, 981.53 and 215.55

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Solution

The fourth proportional to 654.27, 981.53 and 215.55 is: 323.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.27 : 981.53 = 215.55 : x
  2. Step 2: Convert to fraction form
    654.27/981.53 = 215.55/x
  3. Step 3: Cross multiply
    654.27x = 981.53 × 215.55
  4. Step 4: Simplify right side
    654.27x = 211,568.79
  5. Step 5: Solve for x
    x = 211,568.79/654.27
  6. Step 6: Final answer
    x = 323.37

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1.5x scale

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.