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Finding the Fourth Proportional to 543.55, 815.60 and 255.01

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Solution

The fourth proportional to 543.55, 815.60 and 255.01 is: 382.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.55 : 815.60 = 255.01 : x
  2. Step 2: Convert to fraction form
    543.55/815.60 = 255.01/x
  3. Step 3: Cross multiply
    543.55x = 815.60 × 255.01
  4. Step 4: Simplify right side
    543.55x = 207,984.88
  5. Step 5: Solve for x
    x = 207,984.88/543.55
  6. Step 6: Final answer
    x = 382.64

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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.