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Finding the Fourth Proportional to 645.38, 891.05 and 495.73

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Solution

The fourth proportional to 645.38, 891.05 and 495.73 is: 684.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.38 : 891.05 = 495.73 : x
  2. Step 2: Convert to fraction form
    645.38/891.05 = 495.73/x
  3. Step 3: Cross multiply
    645.38x = 891.05 × 495.73
  4. Step 4: Simplify right side
    645.38x = 441,720.22
  5. Step 5: Solve for x
    x = 441,720.22/645.38
  6. Step 6: Final answer
    x = 684.43

Related Problems

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.