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Finding the Fourth Proportional to 578.72, 799.79 and 438.78

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Solution

The fourth proportional to 578.72, 799.79 and 438.78 is: 606.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.72 : 799.79 = 438.78 : x
  2. Step 2: Convert to fraction form
    578.72/799.79 = 438.78/x
  3. Step 3: Cross multiply
    578.72x = 799.79 × 438.78
  4. Step 4: Simplify right side
    578.72x = 350,929.66
  5. Step 5: Solve for x
    x = 350,929.66/578.72
  6. Step 6: Final answer
    x = 606.39

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.