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Finding the Fourth Proportional to 543.60, 813.60 and 381.60

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Solution

The fourth proportional to 543.60, 813.60 and 381.60 is: 571.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.60 : 813.60 = 381.60 : x
  2. Step 2: Convert to fraction form
    543.60/813.60 = 381.60/x
  3. Step 3: Cross multiply
    543.60x = 813.60 × 381.60
  4. Step 4: Simplify right side
    543.60x = 310,469.76
  5. Step 5: Solve for x
    x = 310,469.76/543.60
  6. Step 6: Final answer
    x = 571.14

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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.