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Finding the Fourth Proportional to 685.50, 946.11 and 423.69

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Solution

The fourth proportional to 685.50, 946.11 and 423.69 is: 584.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.50 : 946.11 = 423.69 : x
  2. Step 2: Convert to fraction form
    685.50/946.11 = 423.69/x
  3. Step 3: Cross multiply
    685.50x = 946.11 × 423.69
  4. Step 4: Simplify right side
    685.50x = 400,857.35
  5. Step 5: Solve for x
    x = 400,857.35/685.50
  6. Step 6: Final answer
    x = 584.77

Related Problems

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.