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Finding the Fourth Proportional to 543.28, 814.14 and 419.45

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Solution

The fourth proportional to 543.28, 814.14 and 419.45 is: 628.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.28 : 814.14 = 419.45 : x
  2. Step 2: Convert to fraction form
    543.28/814.14 = 419.45/x
  3. Step 3: Cross multiply
    543.28x = 814.14 × 419.45
  4. Step 4: Simplify right side
    543.28x = 341,484.86
  5. Step 5: Solve for x
    x = 341,484.86/543.28
  6. Step 6: Final answer
    x = 628.57

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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.