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Finding the Fourth Proportional to 543.24, 814.84 and 390.44

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Solution

The fourth proportional to 543.24, 814.84 and 390.44 is: 585.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.24 : 814.84 = 390.44 : x
  2. Step 2: Convert to fraction form
    543.24/814.84 = 390.44/x
  3. Step 3: Cross multiply
    543.24x = 814.84 × 390.44
  4. Step 4: Simplify right side
    543.24x = 318,147.19
  5. Step 5: Solve for x
    x = 318,147.19/543.24
  6. Step 6: Final answer
    x = 585.65

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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.