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Finding the Fourth Proportional to 654.36, 981.55 and 221.51

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Solution

The fourth proportional to 654.36, 981.55 and 221.51 is: 332.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.36 : 981.55 = 221.51 : x
  2. Step 2: Convert to fraction form
    654.36/981.55 = 221.51/x
  3. Step 3: Cross multiply
    654.36x = 981.55 × 221.51
  4. Step 4: Simplify right side
    654.36x = 217,423.14
  5. Step 5: Solve for x
    x = 217,423.14/654.36
  6. Step 6: Final answer
    x = 332.27

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.