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Finding the Fourth Proportional to 654.51, 981.57 and 221.61

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Solution

The fourth proportional to 654.51, 981.57 and 221.61 is: 332.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.51 : 981.57 = 221.61 : x
  2. Step 2: Convert to fraction form
    654.51/981.57 = 221.61/x
  3. Step 3: Cross multiply
    654.51x = 981.57 × 221.61
  4. Step 4: Simplify right side
    654.51x = 217,525.73
  5. Step 5: Solve for x
    x = 217,525.73/654.51
  6. Step 6: Final answer
    x = 332.35

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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.