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Finding the Fourth Proportional to 543.27, 815.65 and 279.91

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Solution

The fourth proportional to 543.27, 815.65 and 279.91 is: 420.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.27 : 815.65 = 279.91 : x
  2. Step 2: Convert to fraction form
    543.27/815.65 = 279.91/x
  3. Step 3: Cross multiply
    543.27x = 815.65 × 279.91
  4. Step 4: Simplify right side
    543.27x = 228,308.59
  5. Step 5: Solve for x
    x = 228,308.59/543.27
  6. Step 6: Final answer
    x = 420.25

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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.