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Finding the Fourth Proportional to 543.62, 815.43 and 218.99

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Solution

The fourth proportional to 543.62, 815.43 and 218.99 is: 328.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.62 : 815.43 = 218.99 : x
  2. Step 2: Convert to fraction form
    543.62/815.43 = 218.99/x
  3. Step 3: Cross multiply
    543.62x = 815.43 × 218.99
  4. Step 4: Simplify right side
    543.62x = 178,571.02
  5. Step 5: Solve for x
    x = 178,571.02/543.62
  6. Step 6: Final answer
    x = 328.49

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.